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We have a failure if Catalyst initializes itself in different orders. This should NOT matter. From Jeff:

We had, essentially,

processor = vtkCPProcessor::New();
pipeline  = vtkCPPythonScriptPipeline::New();
processor->Initialize();
pipeline->Initialize(catalyst_python_file_name.c_str());

And I discovered it was dying after "vtkCPPythonScriptPipeline::New();"

I switched the order thus, to match the example:

processor = vtkCPProcessor::New();
processor->Initialize();
pipeline  = vtkCPPythonScriptPipeline::New();
pipeline->Initialize(catalyst_python_file_name.c_str());

And it started working.

Since it worked in 5.6, I suspect some change in vtkCPProcessor and/or vtkCPPythonScriptPipeline which triggered an error in my ordering that did not previously exist, and none of the tests or examples used my (previously working) ordering.