In earlier releases I realized that a project saved with GPU-mode could not be opened without GPU-mode but I didn’t examine the XML-data of the project-file for possibilities to switch the project back later.
For me the conclusion is just to ignore GPU-feature as long as it is beta.
Part of Crashreport perhaps usefull for you programmers:
Process: Shotcut [1557]
Path: /Applications/Shotcut.app/Contents/MacOS/Shotcut
Identifier: com.Meltytech.Shotcut
Version: 16.09 (16.09.01)
Code Type: X86-64 (Native)
OS Version: Mac OS X 10.11.6 (15G1004)
Crashed Thread: 0 Dispatch queue: com.apple.main-thread
Exception Type: EXC_BAD_ACCESS (SIGSEGV)
Exception Codes: KERN_INVALID_ADDRESS at 0x0000000000000000
Exception Note: EXC_CORPSE_NOTIFY
VM Regions Near 0:
-->
__TEXT 0000000105c65000-0000000105f62000 [ 3060K] r-x/rwx SM=COW /Applications/Shotcut.app/Contents/MacOS/Shotcut
Thread 0 Crashed:: Dispatch queue: com.apple.main-thread
0 QtCore 0x000000010620498d QThreadStorageData::get() const + 45
1 QtCore 0x00000001061e06c9 QUnifiedTimer::instance(bool) + 25
2 QtCore 0x00000001061e237a QAnimationTimer::startAnimations() + 42
3 QtCore 0x00000001063e1153 QObject::event(QEvent*) + 739
4 QtWidgets 0x0000000106ef3f97 QApplicationPrivate::notify_helper(QObject*, QEvent*) + 295
5 QtWidgets 0x0000000106ef74db QApplication::notify(QObject*, QEvent*) + 8459
6 QtCore 0x00000001063b6220 QCoreApplication::notifyInternal2(QObject*, QEvent*) + 160
7 QtCore 0x00000001063b6eb1 QCoreApplicationPrivate::sendPostedEvents(QObject*, int, QThreadData*) + 609
8 libqcocoa.dylib 0x000000010d73599e QCocoaEventDispatcherPrivate::processPostedEvents() + 190
9 libqcocoa.dylib 0x000000010d7362a1 QCocoaEventDispatcherPrivate::postedEventsSourceCallback(void*) + 33
10 com.apple.CoreFoundation 0x00007fff89a0a881 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 17
11 com.apple.CoreFoundation 0x00007fff899e9fbc __CFRunLoopDoSources0 + 556
12 com.apple.CoreFoundation 0x00007fff899e94df __CFRunLoopRun + 927
13 com.apple.CoreFoundation 0x00007fff899e8ed8 CFRunLoopRunSpecific + 296
14 com.apple.HIToolbox 0x00007fff9285d935 RunCurrentEventLoopInMode + 235
15 com.apple.HIToolbox 0x00007fff9285d76f ReceiveNextEventCommon + 432
16 com.apple.HIToolbox 0x00007fff9285d5af _BlockUntilNextEventMatchingListInModeWithFilter + 71
17 com.apple.AppKit 0x00007fff967e7df6 _DPSNextEvent + 1067
18 com.apple.AppKit 0x00007fff967e7226 -[NSApplication _nextEventMatchingEventMask:untilDate:inMode:dequeue:] + 454
19 com.apple.AppKit 0x00007fff967dbd80 -[NSApplication run] + 682
20 libqcocoa.dylib 0x000000010d73510f QCocoaEventDispatcher::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) + 2159
21 QtCore 0x00000001063b2721 QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) + 401
22 QtCore 0x00000001063b691a QCoreApplication::exec() + 346
23 com.Meltytech.Shotcut 0x0000000105c6cb84 main + 1172
24 com.Meltytech.Shotcut 0x0000000105c6c6e4 start + 52