robp_sidefx
If you delete that 0kb file and try again do you end up in the same position, or does it now work? We've been unable to reproduce anything like this so far.
I'm having the same issue on Rocky Linux 9.3, 20.0.653. If I delete the 0kb rendergallery.db file, it complains of the same error, creates the empty file again, and goes to in memory storage.