I used to see this problem a lot back when I used the line work contained in imported DWG for modeling with. You wouldn’t think it should be a problem, but practical experience seemed to expose some vulnerability that I can’t explain. Maybe the import of floating point numbers and doing some math introduces some small error that gets exposed through later manipulation. I still draw lots of stuff in a 2D program, and import DWGs, but I mostly just use them as a tracing guide while drawing and modeling from scratch with native tools. Since I’ve been doing things this way, I haven’t had this problem in a while. One exception, though, is organic curves like contour lines. I use them straight out of the imported DWG.
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