I can only speak for myself and not for Soizic. Yes, I have Capture One 2021 but the last time I used it was last year in November 2021. That's when I ingested my last batch of pictures from my camera.
I only use Capture One for improving my RAW-files after import and I only use the Auto Adjust function, nothing else. Yes, I know it's a waste of resources but I am not a professional photographer and I'm not willing to spend hours of time tying to touch-up my photographs. The Auto Adjust function does do a great job for over and/or under exposed pictures.
Once the pictures have been Auto Adjusted I then take them back in PM6+ where I add the tags.
I don't use any other function from Capture One at all and, as I said, it has been over two months since I last opened the program.
The problems with my Catalogs in PM6+ started last week.
So, I'm pretty sure I can eliminate that possibility.
Thanks for the suggestion anyway as I try to pinpoint what went wrong.
Cheers,
Luke