To reproduce:
1. Open the scene "PianoHero" in "Assets\Game\Scenes\PianoHero 3\PianoHero"
2. Press "Play"
3. After the scene loads, press the escape key.
4. Click "Restart level" and "yes"
Notice that after the screen fades to black, Unity crashes.

The crash doesn't happen when the user's code is executing, but after that.

Stacktrace ends with VertexBufferD3D9::EndWriteVertices or CreateDirect3D11SurfaceFromDXGISurface, depending on which version of directX is used.

On 5.3 the bug reporter appears and the stack trace is printed to the editor log, while on 5.2 the reporter doesn't appear, and the last line on the editor log is "========== OUTPUTING STACK TRACE =================="