I have been running into this issue since Z4.
I have a bunch-correction-a TON of models that were created is Z3.5 or Z3.2 (which ever one was the last PC version, I have both Mac and PC so I get confused) and when I load them into Z4 and try to even touch another layer besides to one that was active when I loaded it the model gets distorted beyond belief and its impossible to recover from it.
Many of these models were created on a Mac running Boot camp, so would that be an issue loading them onto a full PC platform?
I’ve been waiting for a bug fix for this but the problem is still there on Z4r2. Am I the only person experiencing this?