Bob Wood - Unfortunately it looks like the EDU mark is an active bug, but will be fixed in our 2023R1 release. We are actively working with the development team to identify a workaround for the issue. If you did not experience this in previous releases, you can revert back to that version for all new models/drawings for the time being.
For your file issue, are all of your files stored locally on your PC? Have you cleared your %temp% directory recently?
CC: Charudatta Mark
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