Hello Andy The tip about using vtkCPInputDataDescription::SetWholeExtent() was perfect. It fixes the *pvti WholeExtents
The image output issue was instead caused by overlapping graphics windows. I have been testing on my workstation where a separate OpenGL window is opened for each MPI task. Making sure these windows don't overlap fixes the problem. While running Live, the dataset extents shown are those of Task 0. If I do an Extract, then the Whole Extents are shown. So I do not have an issue with that. Thanks for the help Jean
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