Not long time to find !
Still a limit reached ...
It was the number of objects in my groups that was problematic.
Indeed I wanted to export my groups and when I saw their size of 2.1 GB , I immediately understood ...
Conclusion: Not too many objects in SH3D files ...
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Evil progresses when good people do nothing!
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SH3D 7.1 and nothing else - W11 64b in 4K
