This seems to be a bug... If I go to Process - Segment selection - choose "only selected elements", the members will not segment unless I assign a section and material. If none are assigned then I get a "material not assigned or section not assigned" error.
I would say so. I can't see a good reason to stop segmentation due to missing parameters. Other tools like Spreadsheet - Segmentation - Segment beam... do work even without materials or sections assigned.
Answer Verified By: RFreund