This occured today when I was trying to check a file in manually. Any thoughts?
Most likely the future version of SOLIDWORKS drawing file
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What’s so weird is that I’m saving that with sw 2021. I’m on PDM 2021. This used to work.
What specific workflow are you using? I have a 2021 test vault and client so I can see if I can replicate that.
@Gklein got this one right. Turned out to be a broken serial number field that is linked to an add-in.
I do what I can 
it helps when you have access to the SW Knowledgebase.