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After many internal discussions with engineers in my group, I have found out it is an issue with v33.12.1 and the library GVCA02v33.dll. When you open psse via the psspy.psseinit() function, dsusr.dll will automatically be loaded from the current working directory in python and in 2017 vintage MMWG models, the dll GVCA02v33.dll also needs loaded at the same time. I double and triple-checked my pathing to make sure I was in the current working directory but it would not recognize dsusr.dll.

The fix was to go back to v33.12.0 and everything worked without error.

If you are having the same problem with v33.12.1 and dsusr.dll, I suggest asking your IT dept to downgrade you back to v33.12.0 and retry to see if that solves the problem.