After looking through our svn repo and tracking down which commit caused this crash to start happening, I was able to find some repro steps. It looks like if you add a landscape to sequencer and give it a transform track it changes the mobility to movable (specifically in MovieScene3DTransformTrackInstance.cpp in UpdateRuntimeMobility). My artist said it’s likely he had auto-key turned on and accidentally selected/moved the landscape while he was modifying a sequence.
Repro steps for this:
- Create a new project.
- Create a landscape in a blank map.
- Add a spline with 2 control points.
- Create a sequence.
- Turn auto-key on in sequencer and move the landscape.
- Save everything (not strictly necessary but it will allow you to go straight to the crash on subsequent attempts instead of setting up the sequence track each time).
- Go to the landscape editor mode and try to move or add a control point.
- Editor crashes.
I’m attaching a sample project, a copy/paste of the call stack I get when it crashes, and my dxdiag. I’d provide the crash log itself but I can’t find it. According to A new, community-hosted Unreal Engine Wiki - Announcements - Unreal Engine Forums it should be in AppData but I don’t have a ReportQueue folder in AppData/Local/Microsoft/Windows/WER so I couldn’t find it.