SOLVED: Upgrading server to 10.9.1 broke everything

[Tim]

@Sheepyhead

Jellyfin logs in Docker are stored under /config/log/. You can exec into the container with bash to read them. But if you can still access the dashboard and logs, then it is easier to use Dashboard->logs-> (the log(s) you need, I would assume the log created when you started Jellyfin 10.9.x for the first time is the one we need).