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  I hope it was a recent copy of the source, I have been trying to track down the random black screen issue, every time I think it's fixed it shows up after running and exiting a number of times, just ran and rendered a few seconds ago again and it (latest on website) seems fine, no black screen yet.

edit:I've moved just about everything to Qt5s QOpenGL stuff vs QGL except for QGLWidget, I think this is the source of the bug and hope it will be gone for good when/if I get things converted over to QOpenGLSurface and friends.