Timeline dock missing when building from source on linux

I’ve built from source (ae36d5bc23c4307b35b06fa45fa3a8d8226799b8).
Shotcut starts, but the Timeline dock shows a white box (bottom right):

I also cannot open any files.
Starting Shotcut from AppImage (24.01) works

Debug output for Timeline seems clear:

[Debug  ] <TimelineDock::TimelineDock> begin 
[Debug  ] <TimelineDock::TimelineDock> end 

Shotcut starts with some warnings:

libDeckLinkAPI.so: cannot open shared object file: No such file or directory
[Warning] <MLT> [consumer 0x555c626325b0] The DeckLink drivers not installed.

libDeckLinkAPI.so was mentioned as optional: Crash in ubuntu, missing decklink lib
24.01 AppImage runs fine, and emits the same message.

I also get several of:

[Warning] <FilterController::loadFilterMetadata> "file:///usr/local/share/shotcut/qml/filters/alpha_adjust/meta.qml:-1 module \"QtQml.WorkerScript\" is not installed\n" 

That means the filters are missing (still figuring out why it won’t use QtQml.WorkerScript in package qt6-declarative).

Has somebody encountered a missing Timeline and can suggest a cause?
Can I enable additional debugging to figure out the cause?

Below is the console output on startup:

[Debug  ] <MainWindow::changeTheme> end 
[Debug  ] <MainWindow::MainWindow> begin 
[Info   ] <MainWindow::MainWindow> device pixel ratio = 1 
[Debug  ] <Mlt::Controller::Controller> begin 
[Info   ] <Mlt::Controller::resetLocale> decimal point . 
[Debug  ] <Mlt::Controller::Controller> end 
[Debug  ] <Mlt::VideoWidget::VideoWidget> begin 
[Debug  ] <Mlt::VideoWidget::VideoWidget> end 
[Debug  ] <MainWindow::setupSettingsMenu> begin 
libDeckLinkAPI.so: cannot open shared object file: No such file or directory
[Warning] <MLT> [consumer 0x556300e93cf0] The DeckLink drivers not installed.
[Debug  ] <MainWindow::setupSettingsMenu> end 
[Debug  ] <MainWindow::readPlayerSettings> begin 
[Debug  ] <MainWindow::setAudioChannels> 2 
[Debug  ] <Mlt::Controller::setAudioChannels> 2 
[Debug  ] <MainWindow::setPreviewScale> 0 
[Debug  ] <Mlt::Controller::setPreviewScale> 720 x 576 
[Debug  ] <MainWindow::readPlayerSettings> end 
[Debug  ] <MainWindow::configureVideoWidget> begin 
[Debug  ] <MainWindow::setProfile> "" 
[Debug  ] <Mlt::Controller::setProfile> setting to profile "Automatic" 
[Debug  ] <MainWindow::setAudioChannels> 2 
[Debug  ] <Mlt::Controller::setAudioChannels> 2 
[Debug  ] <MainWindow::configureVideoWidget> end 
[Debug  ] <ScopeController::ScopeController> begin 
[Debug  ] <ScopeWidget::ScopeWidget> begin true 
[Debug  ] <ScopeWidget::ScopeWidget> end 
[Debug  ] <AudioLoudnessScopeWidget::AudioLoudnessScopeWidget> begin 
[Debug  ] <AudioLoudnessScopeWidget::AudioLoudnessScopeWidget> end 
[Debug  ] <ScopeDock::ScopeDock> begin 
[Debug  ] <ScopeDock::ScopeDock> end 
[Debug  ] <AudioLoudnessScopeWidget::resetQview> begin isSceneGraphInitialized false 
[Debug  ] <ScopeWidget::ScopeWidget> begin true 
[Debug  ] <ScopeWidget::ScopeWidget> end 
[Debug  ] <AudioPeakMeterScopeWidget::AudioPeakMeterScopeWidget> begin 
[Debug  ] <AudioPeakMeterScopeWidget::AudioPeakMeterScopeWidget> end 
[Debug  ] <ScopeDock::ScopeDock> begin 
[Debug  ] <ScopeDock::ScopeDock> end 
[Debug  ] <ScopeWidget::ScopeWidget> begin true 
[Debug  ] <ScopeWidget::ScopeWidget> end 
[Debug  ] <AudioSpectrumScopeWidget::AudioSpectrumScopeWidget> begin 
[Debug  ] <AudioSpectrumScopeWidget::AudioSpectrumScopeWidget> end 
[Debug  ] <ScopeDock::ScopeDock> begin 
[Debug  ] <ScopeDock::ScopeDock> end 
[Debug  ] <ScopeWidget::ScopeWidget> begin true 
[Debug  ] <ScopeWidget::ScopeWidget> end 
[Debug  ] <AudioWaveformScopeWidget::AudioWaveformScopeWidget> begin 
[Debug  ] <AudioWaveformScopeWidget::AudioWaveformScopeWidget> end 
[Debug  ] <ScopeDock::ScopeDock> begin 
[Debug  ] <ScopeDock::ScopeDock> end 
[Debug  ] <ScopeWidget::ScopeWidget> begin true 
[Debug  ] <ScopeWidget::ScopeWidget> end 
[Debug  ] <VideoHistogramScopeWidget::VideoHistogramScopeWidget> begin 
[Debug  ] <VideoHistogramScopeWidget::VideoHistogramScopeWidget> end 
[Debug  ] <ScopeDock::ScopeDock> begin 
[Debug  ] <ScopeDock::ScopeDock> end 
[Debug  ] <ScopeWidget::ScopeWidget> begin true 
[Debug  ] <ScopeWidget::ScopeWidget> end 
[Debug  ] <VideoRgbParadeScopeWidget::VideoRgbParadeScopeWidget> begin 
[Debug  ] <VideoRgbParadeScopeWidget::VideoRgbParadeScopeWidget> end 
[Debug  ] <ScopeDock::ScopeDock> begin 
[Debug  ] <ScopeDock::ScopeDock> end 
[Debug  ] <ScopeWidget::ScopeWidget> begin true 
[Debug  ] <ScopeWidget::ScopeWidget> end 
[Debug  ] <VideoRgbWaveformScopeWidget::VideoRgbWaveformScopeWidget> begin 
[Debug  ] <VideoRgbWaveformScopeWidget::VideoRgbWaveformScopeWidget> end 
[Debug  ] <ScopeDock::ScopeDock> begin 
[Debug  ] <ScopeDock::ScopeDock> end 
[Debug  ] <ScopeWidget::ScopeWidget> begin true 
[Debug  ] <ScopeWidget::ScopeWidget> end 
[Debug  ] <VideoVectorScopeWidget::VideoVectorScopeWidget> begin 
[Debug  ] <VideoVectorScopeWidget::profileChanged> 709 
[Debug  ] <VideoVectorScopeWidget::VideoVectorScopeWidget> end 
[Debug  ] <ScopeDock::ScopeDock> begin 
[Debug  ] <ScopeDock::ScopeDock> end 
[Debug  ] <ScopeWidget::ScopeWidget> begin true 
[Debug  ] <ScopeWidget::ScopeWidget> end 
[Debug  ] <VideoWaveformScopeWidget::VideoWaveformScopeWidget> begin 
[Debug  ] <VideoWaveformScopeWidget::VideoWaveformScopeWidget> end 
[Debug  ] <ScopeDock::ScopeDock> begin 
[Debug  ] <ScopeDock::ScopeDock> end 
[Debug  ] <ScopeWidget::ScopeWidget> begin true 
[Debug  ] <ScopeWidget::ScopeWidget> end 
[Debug  ] <VideoZoomWidget::VideoZoomWidget> begin 
[Debug  ] <VideoZoomWidget::VideoZoomWidget> end 
[Debug  ] <VideoZoomScopeWidget::VideoZoomScopeWidget> begin 
[Debug  ] <VideoZoomScopeWidget::VideoZoomScopeWidget> end 
[Debug  ] <ScopeDock::ScopeDock> begin 
[Debug  ] <ScopeDock::ScopeDock> end 
[Debug  ] <ScopeController::ScopeController> end 
[Debug  ] <RecentDock::RecentDock> begin 
[Debug  ] <RecentDock::RecentDock> end 
[Debug  ] <PlaylistDock::PlaylistDock> begin 
[Debug  ] <PlaylistDock::PlaylistDock> end 
[Debug  ] <TimelineDock::TimelineDock> begin 
[Debug  ] <TimelineDock::TimelineDock> end 
[Debug  ] <FiltersDock::FiltersDock> begin 
[Debug  ] <FiltersDock::FiltersDock> end 
[Debug  ] <MarkersDock::MarkersDock> begin 
[Debug  ] <MarkersDock::MarkersDock> end 
[Debug  ] <KeyframesDock::KeyframesDock> begin 
[Debug  ] <KeyframesDock::KeyframesDock> end 
[Debug  ] <EncodeDock::EncodeDock> begin 
[Debug  ] <EncodeDock::EncodeDock> end 
[Debug  ] <JobsDock::JobsDock> begin 
[Debug  ] <JobsDock::JobsDock> end 
[Debug  ] <NotesDock::NotesDock> begin 
[Debug  ] <NotesDock::NotesDock> end 
[Debug  ] <MainWindow::readWindowSettings> begin 
[Debug  ] <AudioLoudnessScopeWidget::resetQview> begin isSceneGraphInitialized false 
[Debug  ] <MainWindow::readWindowSettings> end 
[Debug  ] <MainWindow::MainWindow> end 
[Debug  ] <FiltersDock::resetQview> begin 
[Debug  ] <KeyframesDock::load> begin true false 
[Debug  ] <OpenGLVideoWidget::initialize> begin 
[Info   ] <OpenGLVideoWidget::initialize> OpenGL vendor "Intel" 
[Info   ] <OpenGLVideoWidget::initialize> OpenGL renderer "Mesa Intel(R) Xe Graphics (TGL GT2)" 
[Info   ] <OpenGLVideoWidget::initialize> OpenGL threaded? true 
[Info   ] <OpenGLVideoWidget::initialize> OpenGL ES? false 
[Info   ] <OpenGLVideoWidget::initialize> OpenGL maximum texture size = 16384 
[Info   ] <OpenGLVideoWidget::initialize> OpenGL maximum viewport size = 16384 x 16384 
[Debug  ] <OpenGLVideoWidget::initialize> end 
[Debug  ] <Mlt::VideoWidget::initialize> begin 
[Debug  ] <Mlt::VideoWidget::initialize> end 
[Debug  ] <NewProjectFolder::showEvent> m_profile "" action.data "" 
[Info   ] <Util::isMemoryLow> available RAM =  3652572 KB 
[Debug  ] <FilterController::loadFilterMetadata> reading filter metadata "alpha_adjust" "meta.qml" 
[Warning] <FilterController::loadFilterMetadata> "file:///usr/local/share/shotcut/qml/filters/alpha_adjust/meta.qml:-1 module \"QtQml.WorkerScript\" is not installed\n" 
[Debug  ] <FilterController::loadFilterMetadata> reading filter metadata "alpha_view" "meta.qml" 
[Warning] <FilterController::loadFilterMetadata> "file:///usr/local/share/shotcut/qml/filters/alpha_view/meta.qml:-1 module \"QtQml.WorkerScript\" is not installed\n" 
[Debug  ] <FilterController::loadFilterMetadata> reading filter metadata "audio_adeclick" "meta.qml" 
[Warning] <FilterController::loadFilterMetadata> "file:///usr/local/share/shotcut/qml/filters/audio_adeclick/meta.qml:-1 module \"QtQml.WorkerScript\" is not installed\n" 
[Debug  ] <FilterController::loadFilterMetadata> reading filter metadata "audio_autofade" "meta.qml" 
[Warning] <FilterController::loadFilterMetadata> "file:///usr/local/share/shotcut/qml/filters/audio_autofade/meta.qml:-1 module \"QtQml.WorkerScript\" is not installed\n" 
[Debug  ] <FilterController::loadFilterMetadata> reading filter metadata "audio_balance" "meta.qml" 
[Warning] <FilterController::loadFilterMetadata> "file:///usr/local/share/shotcut/qml/filters/audio_balance/meta.qml:-1 module \"QtQml.WorkerScript\" is not installed\n" 
[Debug  ] <FilterController::loadFilterMetadata> reading filter metadata "audio_bandpass" "meta.qml" 
[Warning] <FilterController::loadFilterMetadata> "file:///usr/local/share/shotcut/qml/filters/audio_bandpass/meta.qml:-1 module \"QtQml.WorkerScript\" is not installed\n" 
[Debug  ] <FilterController::loadFilterMetadata> reading filter metadata "audio_basstreble" "meta.qml" 
[Warning] <FilterController::loadFilterMetadata> "file:///usr/local/share/shotcut/qml/filters/audio_basstreble/meta.qml:-1 module \"QtQml.WorkerScript\" is not installed\n" 
[Debug  ] <FilterController::loadFilterMetadata> reading filter metadata "audio_channelcopy" "meta.qml" 
[Warning] <FilterController::loadFilterMetadata> "file:///usr/local/share/shotcut/qml/filters/audio_channelcopy/meta.qml:-1 module \"QtQml.WorkerScript\" is not installed\n" 
[Debug  ] <FilterController::loadFilterMetadata> reading filter metadata "audio_compressor" "meta.qml" 
[Warning] <FilterController::loadFilterMetadata> "file:///usr/local/share/shotcut/qml/filters/audio_compressor/meta.qml:-1 module \"QtQml.WorkerScript\" is not installed\n" 
[Debug  ] <FilterController::loadFilterMetadata> reading filter metadata "audio_delay" "meta.qml" 
[Warning] <FilterController::loadFilterMetadata> "file:///usr/local/share/shotcut/qml/filters/audio_delay/meta.qml:-1 module \"QtQml.WorkerScript\" is not installed\n" 
[Debug  ] <FilterController::loadFilterMetadata> reading filter metadata "audio_eq15band" "meta.qml" 
[Warning] <FilterController::loadFilterMetadata> "file:///usr/local/share/shotcut/qml/filters/audio_eq15band/meta.qml:-1 module \"QtQml.WorkerScript\" is not installed\n" 
[Debug  ] <FilterController::loadFilterMetadata> reading filter metadata "audio_eq3band" "meta.qml" 
[Warning] <FilterController::loadFilterMetadata> "file:///usr/local/share/shotcut/qml/filters/audio_eq3band/meta.qml:-1 module \"QtQml.WorkerScript\" is not installed\n" 
[Debug  ] <FilterController::loadFilterMetadata> reading filter metadata "audio_eqparametric" "meta.qml" 
[Warning] <FilterController::loadFilterMetadata> "file:///usr/local/share/shotcut/qml/filters/audio_eqparametric/meta.qml:-1 module \"QtQml.WorkerScript\" is not installed\n" 
[Debug  ] <FilterController::loadFilterMetadata> reading filter metadata "audio_expander" "meta.qml" 
[Warning] <FilterController::loadFilterMetadata> "file:///usr/local/share/shotcut/qml/filters/audio_expander/meta.qml:-1 module \"QtQml.WorkerScript\" is not installed\n" 
[Debug  ] <FilterController::loadFilterMetadata> reading filter metadata "audio_fadein" "meta.qml" 
[Warning] <FilterController::loadFilterMetadata> "file:///usr/local/share/shotcut/qml/filters/audio_fadein/meta.qml:-1 module \"QtQml.WorkerScript\" is not installed\n" 
[Debug  ] <FilterController::loadFilterMetadata> reading filter metadata "audio_fadeout" "meta.qml" 
[Warning] <FilterController::loadFilterMetadata> "file:///usr/local/share/shotcut/qml/filters/audio_fadeout/meta.qml:-1 module \"QtQml.WorkerScript\" is not installed\n" 
[Debug  ] <FilterController::loadFilterMetadata> reading filter metadata "audio_gain" "meta.qml" 
[Warning] <FilterController::loadFilterMetadata> "file:///usr/local/share/shotcut/qml/filters/audio_gain/meta.qml:-1 module \"QtQml.WorkerScript\" is not installed\n" 
[Debug  ] <FilterController::loadFilterMetadata> reading filter metadata "audio_highpass" "meta.qml" 
[Warning] <FilterController::loadFilterMetadata> "file:///usr/local/share/shotcut/qml/filters/audio_highpass/meta.qml:-1 module \"QtQml.WorkerScript\" is not installed\n" 
[Debug  ] <FilterController::loadFilterMetadata> reading filter metadata "audio_invert" "meta.qml" 
[Warning] <FilterController::loadFilterMetadata> "file:///usr/local/share/shotcut/qml/filters/audio_invert/meta.qml:-1 module \"QtQml.WorkerScript\" is not installed\n" 
[Debug  ] <FilterController::loadFilterMetadata> reading filter metadata "audio_limiter" "meta.qml" 
[Warning] <FilterController::loadFilterMetadata> "file:///usr/local/share/shotcut/qml/filters/audio_limiter/meta.qml:-1 module \"QtQml.WorkerScript\" is not installed\n" 
[Debug  ] <FilterController::loadFilterMetadata> reading filter metadata "audio_lowpass" "meta.qml" 
[Warning] <FilterController::loadFilterMetadata> "file:///usr/local/share/shotcut/qml/filters/audio_lowpass/meta.qml:-1 module \"QtQml.WorkerScript\" is not installed\n" 
[Debug  ] <FilterController::loadFilterMetadata> reading filter metadata "audio_mono" "meta.qml" 
[Warning] <FilterController::loadFilterMetadata> "file:///usr/local/share/shotcut/qml/filters/audio_mono/meta.qml:-1 module \"QtQml.WorkerScript\" is not installed\n" 
[Debug  ] <FilterController::loadFilterMetadata> reading filter metadata "audio_mute" "meta.qml" 
[Warning] <FilterController::loadFilterMetadata> "file:///usr/local/share/shotcut/qml/filters/audio_mute/meta.qml:-1 module \"QtQml.WorkerScript\" is not installed\n" 
[Debug  ] <FilterController::loadFilterMetadata> reading filter metadata "audio_noisegate" "meta.qml" 
[Warning] <FilterController::loadFilterMetadata> "file:///usr/local/share/shotcut/qml/filters/audio_noisegate/meta.qml:-1 module \"QtQml.WorkerScript\" is not installed\n" 
[Debug  ] <FilterController::loadFilterMetadata> reading filter metadata "audio_normalize_1p" "meta.qml" 
[Warning] <FilterController::loadFilterMetadata> "file:///usr/local/share/shotcut/qml/filters/audio_normalize_1p/meta.qml:-1 module \"QtQml.WorkerScript\" is not installed\n" 
[Debug  ] <FilterController::loadFilterMetadata> reading filter metadata "audio_normalize_2p" "meta.qml" 
[Warning] <FilterController::loadFilterMetadata> "file:///usr/local/share/shotcut/qml/filters/audio_normalize_2p/meta.qml:-1 module \"QtQml.WorkerScript\" is not installed\n" 
[Debug  ] <FilterController::loadFilterMetadata> reading filter metadata "audio_notch" "meta.qml" 
[Warning] <FilterController::loadFilterMetadata> "file:///usr/local/share/shotcut/qml/filters/audio_notch/meta.qml:-1 module \"QtQml.WorkerScript\" is not installed\n" 
[Debug  ] <FilterController::loadFilterMetadata> reading filter metadata "audio_pan" "meta.qml" 
[Warning] <FilterController::loadFilterMetadata> "file:///usr/local/share/shotcut/qml/filters/audio_pan/meta.qml:-1 module \"QtQml.WorkerScript\" is not installed\n" 
[Debug  ] <FilterController::loadFilterMetadata> reading filter metadata "audio_pitch" "meta.qml" 
[Warning] <FilterController::loadFilterMetadata> "file:///usr/local/share/shotcut/qml/filters/audio_pitch/meta.qml:-1 module \"QtQml.WorkerScript\" is not installed\n" 
[Debug  ] <FilterController::loadFilterMetadata> reading filter metadata "audio_reverb" "meta.qml" 
[Warning] <FilterController::loadFilterMetadata> "file:///usr/local/share/shotcut/qml/filters/audio_reverb/meta.qml:-1 module \"QtQml.WorkerScript\" is not installed\n" 
[Debug  ] <FilterController::loadFilterMetadata> reading filter metadata "audio_seam" "meta.qml" 
[Warning] <FilterController::loadFilterMetadata> "file:///usr/local/share/shotcut/qml/filters/audio_seam/meta.qml:-1 module \"QtQml.WorkerScript\" is not installed\n" 
[Debug  ] <FilterController::loadFilterMetadata> reading filter metadata "audio_stereoenhance" "meta.qml" 
[Warning] <FilterController::loadFilterMetadata> "file:///usr/local/share/shotcut/qml/filters/audio_stereoenhance/meta.qml:-1 module \"QtQml.WorkerScript\" is not installed\n" 
[Debug  ] <FilterController::loadFilterMetadata> reading filter metadata "audio_swapchannels" "meta.qml" 
[Warning] <FilterController::loadFilterMetadata> "file:///usr/local/share/shotcut/qml/filters/audio_swapchannels/meta.qml:-1 module \"QtQml.WorkerScript\" is not installed\n" 
[Debug  ] <FilterController::loadFilterMetadata> reading filter metadata "audiolevelgraph" "meta.qml" 
[Warning] <FilterController::loadFilterMetadata> "file:///usr/local/share/shotcut/qml/filters/audiolevelgraph/meta.qml:-1 module \"QtQml.WorkerScript\" is not installed\n" 
[Debug  ] <FilterController::loadFilterMetadata> reading filter metadata "bigsh0t_eq_mask" "meta.qml" 
[Warning] <FilterController::loadFilterMetadata> "file:///usr/local/share/shotcut/qml/filters/bigsh0t_eq_mask/meta.qml:-1 module \"QtQml.WorkerScript\" is not installed\n" 
[Debug  ] <FilterController::loadFilterMetadata> reading filter metadata "bigsh0t_eq_to_rect" "meta.qml" 
[Warning] <FilterController::loadFilterMetadata> "file:///usr/local/share/shotcut/qml/filters/bigsh0t_eq_to_rect/meta.qml:-1 module \"QtQml.WorkerScript\" is not installed\n" 
[Debug  ] <FilterController::loadFilterMetadata> reading filter metadata "bigsh0t_eq_to_stereo" "meta.qml" 
[Warning] <FilterController::loadFilterMetadata> "file:///usr/local/share/shotcut/qml/filters/bigsh0t_eq_to_stereo/meta.qml:-1 module \"QtQml.WorkerScript\" is not installed\n" 
[Debug  ] <FilterController::loadFilterMetadata> reading filter metadata "bigsh0t_hemi_to_eq" "meta.qml" 
[Warning] <FilterController::loadFilterMetadata> "file:///usr/local/share/shotcut/qml/filters/bigsh0t_hemi_to_eq/meta.qml:-1 module \"QtQml.WorkerScript\" is not installed\n" 
[Debug  ] <FilterController::loadFilterMetadata> reading filter metadata "bigsh0t_rect_to_eq" "meta.qml" 
[Warning] <FilterController::loadFilterMetadata> "file:///usr/local/share/shotcut/qml/filters/bigsh0t_rect_to_eq/meta.qml:-1 module \"QtQml.WorkerScript\" is not installed\n" 
[Debug  ] <FilterController::loadFilterMetadata> reading filter metadata "bigsh0t_stabilize_360" "meta.qml" 
[Warning] <FilterController::loadFilterMetadata> "file:///usr/local/share/shotcut/qml/filters/bigsh0t_stabilize_360/meta.qml:-1 module \"QtQml.WorkerScript\" is not installed\n" 
[Debug  ] <FilterController::loadFilterMetadata> reading filter metadata "bigsh0t_transform_360" "meta.qml" 
[Warning] <FilterController::loadFilterMetadata> "file:///usr/local/share/shotcut/qml/filters/bigsh0t_transform_360/meta.qml:-1 module \"QtQml.WorkerScript\" is not installed\n" 
[Debug  ] <FilterController::loadFilterMetadata> reading filter metadata "blend_mode" "meta.qml" 
[Warning] <FilterController::loadFilterMetadata> "file:///usr/local/share/shotcut/qml/filters/blend_mode/meta.qml:-1 module \"QtQml.WorkerScript\" is not installed\n" 
[Debug  ] <FilterController::loadFilterMetadata> reading filter metadata "bluescreen0r" "meta.qml" 
[Warning] <FilterController::loadFilterMetadata> "file:///usr/local/share/shotcut/qml/filters/bluescreen0r/meta.qml:-1 module \"QtQml.WorkerScript\" is not installed\n" 
[Debug  ] <FilterController::loadFilterMetadata> reading filter metadata "blur" "meta_box_blur.qml" 
[Warning] <FilterController::loadFilterMetadata> "file:///usr/local/share/shotcut/qml/filters/blur/meta_box_blur.qml:-1 module \"QtQml.WorkerScript\" is not installed\n" 
[Debug  ] <FilterController::loadFilterMetadata> reading filter metadata "blur" "meta_boxblur.qml" 
[Warning] <FilterController::loadFilterMetadata> "file:///usr/local/share/shotcut/qml/filters/blur/meta_boxblur.qml:-1 module \"QtQml.WorkerScript\" is not installed\n" 
[Debug  ] <FilterController::loadFilterMetadata> reading filter metadata "blur" "meta_movit.qml" 
[Warning] <FilterController::loadFilterMetadata> "file:///usr/local/share/shotcut/qml/filters/blur/meta_movit.qml:-1 module \"QtQml.WorkerScript\" is not installed\n" 
[Debug  ] <FilterController::loadFilterMetadata> reading filter metadata "blur_exponential" "meta.qml" 
[Warning] <FilterController::loadFilterMetadata> "file:///usr/local/share/shotcut/qml/filters/blur_exponential/meta.qml:-1 module \"QtQml.WorkerScript\" is not installed\n" 
[Debug  ] <FilterController::loadFilterMetadata> reading filter metadata "blur_gaussian" "meta.qml" 
[Warning] <FilterController::loadFilterMetadata> "file:///usr/local/share/shotcut/qml/filters/blur_gaussian/meta.qml:-1 module \"QtQml.WorkerScript\" is not installed\n" 
[Debug  ] <FilterController::loadFilterMetadata> reading filter metadata "blur_gaussian" "meta_av.qml" 
[Warning] <FilterController::loadFilterMetadata> "file:///usr/local/share/shotcut/qml/filters/blur_gaussian/meta_av.qml:-1 module \"QtQml.WorkerScript\" is not installed\n" 
[Debug  ] <FilterController::loadFilterMetadata> reading filter metadata "blur_lowpass" "meta.qml" 
[Warning] <FilterController::loadFilterMetadata> "file:///usr/local/share/shotcut/qml/filters/blur_lowpass/meta.qml:-1 module \"QtQml.WorkerScript\" is not installed\n" 
[Debug  ] <FilterController::loadFilterMetadata> reading filter metadata "brightness" "meta.qml" 
[Warning] <FilterController::loadFilterMetadata> "file:///usr/local/share/shotcut/qml/filters/brightness/meta.qml:-1 module \"QtQml.WorkerScript\" is not installed\n" 
[Debug  ] <FilterController::loadFilterMetadata> reading filter metadata "brightness" "meta_movit.qml" 
[Warning] <FilterController::loadFilterMetadata> "file:///usr/local/share/shotcut/qml/filters/brightness/meta_movit.qml:-1 module \"QtQml.WorkerScript\" is not installed\n" 
[Debug  ] <FilterController::loadFilterMetadata> reading filter metadata "choppy" "meta.qml" 
[Warning] <FilterController::loadFilterMetadata> "file:///usr/local/share/shotcut/qml/filters/choppy/meta.qml:-1 module \"QtQml.WorkerScript\" is not installed\n" 
[Debug  ] <FilterController::loadFilterMetadata> reading filter metadata "chromahold" "meta.qml" 
[Warning] <FilterController::loadFilterMetadata> "file:///usr/local/share/shotcut/qml/filters/chromahold/meta.qml:-1 module \"QtQml.WorkerScript\" is not installed\n" 
[Debug  ] <FilterController::loadFilterMetadata> reading filter metadata "color" "meta.qml" 
[Warning] <FilterController::loadFilterMetadata> "file:///usr/local/share/shotcut/qml/filters/color/meta.qml:-1 module \"QtQml.WorkerScript\" is not installed\n" 
[Debug  ] <FilterController::loadFilterMetadata> reading filter metadata "color" "meta_frei0r_coloradj.qml" 
[Warning] <FilterController::loadFilterMetadata> "file:///usr/local/share/shotcut/qml/filters/color/meta_frei0r_coloradj.qml:-1 module \"QtQml.WorkerScript\" is not installed\n" 
[Debug  ] <FilterController::loadFilterMetadata> reading filter metadata "color" "meta_movit.qml" 
[Warning] <FilterController::loadFilterMetadata> "file:///usr/local/share/shotcut/qml/filters/color/meta_movit.qml:-1 module \"QtQml.WorkerScript\" is not installed\n" 
[Debug  ] <FilterController::loadFilterMetadata> reading filter metadata "contrast" "meta.qml" 
[Warning] <FilterController::loadFilterMetadata> "file:///usr/local/share/shotcut/qml/filters/contrast/meta.qml:-1 module \"QtQml.WorkerScript\" is not installed\n" 
[Debug  ] <FilterController::loadFilterMetadata> reading filter metadata "contrast" "meta_movit.qml" 
[Warning] <FilterController::loadFilterMetadata> "file:///usr/local/share/shotcut/qml/filters/contrast/meta_movit.qml:-1 module \"QtQml.WorkerScript\" is not installed\n" 
[Debug  ] <FilterController::loadFilterMetadata> reading filter metadata "corners" "meta.qml" 
[Warning] <FilterController::loadFilterMetadata> "file:///usr/local/share/shotcut/qml/filters/corners/meta.qml:-1 module \"QtQml.WorkerScript\" is not installed\n" 
[Debug  ] <FilterController::loadFilterMetadata> reading filter metadata "crop" "meta.qml" 
[Warning] <FilterController::loadFilterMetadata> "file:///usr/local/share/shotcut/qml/filters/crop/meta.qml:-1 module \"QtQml.WorkerScript\" is not installed\n" 
[Debug  ] <FilterController::loadFilterMetadata> reading filter metadata "crop" "meta_movit.qml" 
[Warning] <FilterController::loadFilterMetadata> "file:///usr/local/share/shotcut/qml/filters/crop/meta_movit.qml:-1 module \"QtQml.WorkerScript\" is not installed\n" 
[Debug  ] <FilterController::loadFilterMetadata> reading filter metadata "crop_circle" "meta.qml" 
[Warning] <FilterController::loadFilterMetadata> "file:///usr/local/share/shotcut/qml/filters/crop_circle/meta.qml:-1 module \"QtQml.WorkerScript\" is not installed\n" 
[Debug  ] <FilterController::loadFilterMetadata> reading filter metadata "crop_rectangle" "meta.qml" 
[Warning] <FilterController::loadFilterMetadata> "file:///usr/local/share/shotcut/qml/filters/crop_rectangle/meta.qml:-1 module \"QtQml.WorkerScript\" is not installed\n" 
[Debug  ] <FilterController::loadFilterMetadata> reading filter metadata "dance" "meta_dance.qml" 
[Warning] <FilterController::loadFilterMetadata> "file:///usr/local/share/shotcut/qml/filters/dance/meta_dance.qml:-1 module \"QtQml.WorkerScript\" is not installed\n" 
[Debug  ] <FilterController::loadFilterMetadata> reading filter metadata "deband" "meta.qml" 
[Warning] <FilterController::loadFilterMetadata> "file:///usr/local/share/shotcut/qml/filters/deband/meta.qml:-1 module \"QtQml.WorkerScript\" is not installed\n" 
[Debug  ] <FilterController::loadFilterMetadata> reading filter metadata "distort" "meta.qml" 
[Warning] <FilterController::loadFilterMetadata> "file:///usr/local/share/shotcut/qml/filters/distort/meta.qml:-1 module \"QtQml.WorkerScript\" is not installed\n" 
[Debug  ] <FilterController::loadFilterMetadata> reading filter metadata "dither" "meta.qml" 
[Warning] <FilterController::loadFilterMetadata> "file:///usr/local/share/shotcut/qml/filters/dither/meta.qml:-1 module \"QtQml.WorkerScript\" is not installed\n" 
[Debug  ] <FilterController::loadFilterMetadata> reading filter metadata "dust" "meta.qml" 
[Warning] <FilterController::loadFilterMetadata> "file:///usr/local/share/shotcut/qml/filters/dust/meta.qml:-1 module \"QtQml.WorkerScript\" is not installed\n" 
[Debug  ] <FilterController::loadFilterMetadata> reading filter metadata "dynamictext" "meta.qml" 
[Warning] <FilterController::loadFilterMetadata> "file:///usr/local/share/shotcut/qml/filters/dynamictext/meta.qml:-1 module \"QtQml.WorkerScript\" is not installed\n" 
[Debug  ] <FilterController::loadFilterMetadata> reading filter metadata "elastic_scale" "meta.qml" 
[Warning] <FilterController::loadFilterMetadata> "file:///usr/local/share/shotcut/qml/filters/elastic_scale/meta.qml:-1 module \"QtQml.WorkerScript\" is not installed\n" 
[Debug  ] <FilterController::loadFilterMetadata> reading filter metadata "fadein_brightness" "meta.qml" 
[Warning] <FilterController::loadFilterMetadata> "file:///usr/local/share/shotcut/qml/filters/fadein_brightness/meta.qml:-1 module \"QtQml.WorkerScript\" is not installed\n" 
[Debug  ] <FilterController::loadFilterMetadata> reading filter metadata "fadein_movit" "meta.qml" 
[Warning] <FilterController::loadFilterMetadata> "file:///usr/local/share/shotcut/qml/filters/fadein_movit/meta.qml:-1 module \"QtQml.WorkerScript\" is not installed\n" 
[Debug  ] <FilterController::loadFilterMetadata> reading filter metadata "fadeout_brightness" "meta.qml" 
[Warning] <FilterController::loadFilterMetadata> "file:///usr/local/share/shotcut/qml/filters/fadeout_brightness/meta.qml:-1 module \"QtQml.WorkerScript\" is not installed\n" 
[Debug  ] <FilterController::loadFilterMetadata> reading filter metadata "fadeout_movit" "meta.qml" 
[Warning] <FilterController::loadFilterMetadata> "file:///usr/local/share/shotcut/qml/filters/fadeout_movit/meta.qml:-1 module \"QtQml.WorkerScript\" is not installed\n" 
[Debug  ] <FilterController::loadFilterMetadata> reading filter metadata "fisheye" "meta.qml" 
[Warning] <FilterController::loadFilterMetadata> "file:///usr/local/share/shotcut/qml/filters/fisheye/meta.qml:-1 module \"QtQml.WorkerScript\" is not installed\n" 
[Debug  ] <FilterController::loadFilterMetadata> reading filter metadata "flip" "meta.qml" 
[Warning] <FilterController::loadFilterMetadata> "file:///usr/local/share/shotcut/qml/filters/flip/meta.qml:-1 module \"QtQml.WorkerScript\" is not installed\n" 
[Debug  ] <FilterController::loadFilterMetadata> reading filter metadata "flip" "meta_movit.qml" 
[Warning] <FilterController::loadFilterMetadata> "file:///usr/local/share/shotcut/qml/filters/flip/meta_movit.qml:-1 module \"QtQml.WorkerScript\" is not installed\n" 
[Debug  ] <FilterController::loadFilterMetadata> reading filter metadata "fspp" "meta.qml" 
[Warning] <FilterController::loadFilterMetadata> "file:///usr/local/share/shotcut/qml/filters/fspp/meta.qml:-1 module \"QtQml.WorkerScript\" is not installed\n" 
[Debug  ] <FilterController::loadFilterMetadata> reading filter metadata "glitch" "meta.qml" 
[Warning] <FilterController::loadFilterMetadata> "file:///usr/local/share/shotcut/qml/filters/glitch/meta.qml:-1 module \"QtQml.WorkerScript\" is not installed\n" 

(truncated for post length limit)

[Warning] <FilterController::loadFilterMetadata> "file:///usr/local/share/shotcut/qml/filters/white/meta_movit.qml:-1 module \"QtQml.WorkerScript\" is not installed\n" 
[Debug  ] <MainWindow::open> "/home/dm/.local/share/Meltytech/Shotcut/__untitled__.mlt" 
[Debug  ] <MltXmlChecker::check> begin 
[Debug  ] <MltXmlChecker::check> "" 
[Debug  ] <MltXmlChecker::check> end "" 
[Debug  ] <AudioLoudnessScopeWidget::resetQview> begin isSceneGraphInitialized false 
[Debug  ] <AudioLoudnessScopeWidget::resetQview> begin isSceneGraphInitialized false 

Best,
dejj

You’re probably missing a number of Qt6 packages related to QML and Qt. No, I cannot tell you what all they are because that is distro specific, and I use the general purpose Qt provided Qt SDK. You can learn from reading the CMakeLists.txt or build script, or you can install all of them.

Here are the components I install in the QT Installer tool

try to locate your problem with

ldd ./Shotcut

and

libtree ./Shotcut