Debug numpy - #82
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…group#467) StructProblem.readExternalForceFile temporarily overwrites the shared meshLoader bdfInfo.loads with an un-cross-referenced deepcopy of the loads read from the force file, then calls addLoadFromBDF. That method only cross-references bdfInfo when is_xrefed is False. Because bdfInfo is shared across every problem built from the same assembler/meshLoader, the first StructProblem sets is_xrefed = True; subsequent problems then skip the re-cross-reference of their freshly assigned loads, leaving loadInfo.node_ref as None and raising AttributeError on node_ref.nid. Set bdfInfo.is_xrefed = False after both points where bdfInfo.loads is reassigned (after overwriting with the force-file loads, and after restoring the originals) so the next addLoadFromBDF call re-cross- references the current loads. Regression covered by adding a second StructProblem sharing the same assembler and load file in test_mach_beam_load_file.py. Co-authored-by: Claude Opus 4.8 <noreply@anthropic.com>
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