Client/server crash

We have a crash client server. Here is the important error message. I will send all output by e-mail to @cory-quammen and @utkarsh.ayachit.

pvserver: .../ClientServerCore/Rendering/vtkPVRenderingCapabilitiesInformation.cxx:162: static vtkSmartPointer vtkPVRenderingCapabilitiesInformation::NewOffscreenRenderWindow(): Assertion `window == nullptr || window->GetOffScreenRendering() == 1' failed.

pvserver is run as follows:

(slurm stuff here) pvserver --force-offscreen-rendering -rc -ch=myBlade

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