[vtkusers] How avoid QVTKWidget crash on exit

[Andrew J. Buckler (Elucid Bioimaging)]

Hello,
I have an application of QVTKWidget running nicely on a Mac, but when I ported it to Windows (after much effort to get everything to build cleanly!) I get:

ERROR: In VTK-6.3.0\Rendering\OpenGL\vtkWin32OpenGLRenderWindow.cxx, line 270
vtkWin32OpenGLRenderWindow (0000003B20C1B720): wglMakeCurrent failed in MakeCurrent(), error: The requested resource is in use.

>From the name, this module isn't even used in the Mac stack; so: why is it needed?  How can the error be fixed?

Thank you,
Andy

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