Pretty sure I fixed it, prolly by accident.
Windows 11 updates kept failing. I ran Update Troubleshooter and it fixed a problem so it would update again. My guess, could have been a corrupt windows file. I'm not finding any correlation, but whateva. I guess if I get curious enough I could go through the logs and find the file issue. Too busy.
Any ship film I made after the fix works, any ship film I made before the fix doesn't.
<shrug>