Abhijit, you are a marvel. Changing -1 to 1 did the trick. Thank you. I have generated a complete set of Isometrics for two different pipelines from two different models without error or crash. Wish this had been covered in the OPIM training course, but I suppose you can't possibly cover everything or every situation. The only outstanding item to be fixed now is the lone flange on its own Iso sheet due to the Stop Sign placement issue I mentioned previously in this thread. As per below (see previous item in this thread):
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