It took me a while but I finaly found the solution.
Though I couldn't find anything on google I post it here so that it will
hopefully help someone who encounters this problem.
The source of the problem is that the Viewer Class which initializes the
OpenGL Graphics Context is derived from QGLWidget.
Which for itself sets the Pixelformat. This is only a Problem for the
combination of Windows and NVidia cards with all the driver Versions I
tested.
The SetPixelFormat crashes because it can be called only once for each
device context.
So the solution is to derive only from QWidget instead of QGLWidget.
Cheers,
Robin
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