Hi All,

I am experiencing a strange behavior with an OpenGL window.

I open several windows, one of which is an OpenGL window.
If the windows do not overlay each other everything works fine.
If I move one window on top of the OpenGL window than the GUI hangs and no events are processed. I can't even close the application.

If the OpenGL window is updated with redraw() method then the GUI starts to work again.

Any suggestion on how to solve this problem?

Thanks,
  Marco