I have the same problem, but csladspa does not seem to fix it - i have the snap version installed on ubuntu studio 18.04.
I am not quite sure what to do as i am not very used to this kind of stuff. 
I just tried to run it from the terminal and this was what i got:
env BAMF_DESKTOP_FILE_HINT=/var/lib/snapd/desktop/applications/shotcut_shotcut.desktop /snap/bin/shotcut %F
[Info ] Application::Application Starting Shotcut version 18.10.08
[Info ] Application::Application Linux version
[Info ] Application::Application number of logical cores = 2
[Info ] Application::Application locale = QLocale(Danish, Latin, Denmark)
[Info ] Application::Application install dir = “/snap/shotcut/35/Shotcut.app/bin”
[Info ] Application::Application device pixel ratio = 1
[Debug ] ShotcutSettings::log language “da_DK”
[Debug ] ShotcutSettings::log deinterlacer “onefield”
[Debug ] ShotcutSettings::log external monitor “”
[Debug ] ShotcutSettings::log GPU processing false
[Debug ] ShotcutSettings::log interpolation “nearest”
[Debug ] ShotcutSettings::log video mode “”
[Debug ] ShotcutSettings::log realtime true
[Debug ] ShotcutSettings::log audio channels 2
[Debug ] MainWindow::changeTheme begin
[Debug ] MainWindow::changeTheme end
[Debug ] MainWindow::MainWindow begin
[Info ] GLTestWidget::GLTestWidget OpenGL context version 4 6
[Debug ] Mlt::Controller::Controller begin
free(): invalid pointer
Aborted (core dumped)
This doesnt tell me a thing because i don’t know much about this, but is there anything i can do?
@shotcut i hope you can help (or somebody as well versed in shotcut )