Hi,

I have a strange problem with a macos X build, each time I instantiate a QVideoWidget many control elements in the GUI stops working, especially tree controls.

I noticed that than the application outputs:
QBackingStore::flush() called with non-exposed window, behavior is undefined

on windows and linux this problem does not occurs.

I'm using qt 5.0.2


does anyone head a seminar issue and may be know how to fix it?