[vtkusers] QVTKWidget screen turns out white

[Sanjeet Rohilla]

Hi vtk Users
I have encountered a strange issue, whenever I scrolls slices in the QVTKWidget, the screen turns out white with no image.I have used vtkImageViewer2 and also display text  using vtktextActor on the screen along with slices. 
The whole task is done using python and QVTKWidget.
Please let me know, the solution for this problem.
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