Great, there is a known issue that if thumbnailing fails for some reason then it will never be retried again. Next time you get the problem feel free to comment with the 'journalctl -b 0' log from the session included
Great, there is a known issue that if thumbnailing fails for some reason then it will never be retried again. Next time you get the problem feel free to comment with the 'journalctl -b 0' log from the session included