I think it’s the nominal_len bug. This is one of those “Why can’t Trimble fix this!” issues. There is also a _last _len attribute visible with the SketchUp Attribute viewer. I have found that combinations of grouping and scaling can throw off these three different len values in different ways. It seems that deleting the nominal_len attributes fixes this. I feel as though it’s a patch on a patch , or a Monkey patch @DanRathbun? There are a few ruby scripts in the link that can be executed on a selection to fix it by deleting the nominal_len values. Not a great answer but hopefully a work around for you…
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