[vtkusers] Problems with VTK and PyQt 3.1

[Prof. Andreas Gerber]

Hi, 
I found a strange behaviour while trying to upgrade from PyQt 3.0 (QT 2.3) to 
PyQt 3.1 (QT 3.0.3) under Suse 8.0 and vtk 4.0, python 2.2. The example code 
in QVTKRenderWidget.py works well with both versions of PyQt. 
But if I add a non-empty ToolBar to my application the main window doesn't 
appear and CPU load reaches 100 %.

Andreas