I added a line of text to be rendered in the widget and the whole thing crashes on compile. I open it back up and everything is saved. Everything crashes on compile now. I recently migrated from 4.16 to 4.17 and I work with VR (HTC VIVE)
Access violation - code c0000005 (first/second chance not available)
UE4Editor_CoreUObject!UObjectBase::IsValidLowLevelFast() [d:\build++ue4+release-4.17+compile\sync\engine\source\runtime\coreuobject\private\uobject\uobjectbase.cpp:294]
UE4Editor_Engine!FPersistentFrameCollectorArchive::operator<<() [d:\build++ue4+release-4.17+compile\sync\engine\source\runtime\engine\private\blueprintgeneratedclass.cpp:1444]
UE4Editor_CoreUObject!UStruct::SerializeBin() [d:\build++ue4+release-4.17+compile\sync\engine\source\runtime\coreuobject\private\uobject\class.cpp:835]
UE4Editor_Engine!UBlueprintGeneratedClass::AddReferencedObjectsInUbergraphFrame() [d:\build++ue4+release-4.17+compile\sync\engine\source\runtime\engine\private\blueprintgeneratedclass.cpp:1500]
UE4Editor_CoreUObject!TFastReferenceCollector<1,FGCReferenceProcessor<1>,FGCCollector<1>,FGCArrayPool,0>::ProcessObjectArray() [d:\build++ue4+release-4.17+compile\sync\engine\source\runtime\coreuobject\public\uobject\fastreferencecollector.h:693]
UE4Editor_CoreUObject!TFastReferenceCollector<1,FGCReferenceProcessor<1>,FGCCollector<1>,FGCArrayPool,0>::FCollectorTaskQueue::DoTask() [d:\build++ue4+release-4.17+compile\sync\engine\source\runtime\coreuobject\public\uobject\fastreferencecollector.h:299]
UE4Editor_CoreUObject!TGraphTask,FGCCollector<1>,FGCArrayPool,0>::FCollectorTaskProcessorTask>::ExecuteTask() [d:\build++ue4+release-4.17+compile\sync\engine\source\runtime\core\public\async\taskgraphinterfaces.h:784]
UE4Editor_Core!FTaskThreadAnyThread::ProcessTasks() [d:\build++ue4+release-4.17+compile\sync\engine\source\runtime\core\private\async\taskgraph.cpp:907]
UE4Editor_Core!FTaskThreadAnyThread::ProcessTasksUntilQuit() [d:\build++ue4+release-4.17+compile\sync\engine\source\runtime\core\private\async\taskgraph.cpp:785]
UE4Editor_Core!FTaskThreadBase::Run() [d:\build++ue4+release-4.17+compile\sync\engine\source\runtime\core\private\async\taskgraph.cpp:501]
UE4Editor_Core!FRunnableThreadWin::Run() [d:\build++ue4+release-4.17+compile\sync\engine\source\runtime\core\private\windows\windowsrunnablethread.cpp:76]