The thread title is the message I get whenever I try to access my user page, bookmarks or settings.
I could live without my user page or bookmarks, but what if I want to, like, change my password or something. Oh no!
I hope I’m the only one with this problem right now but even if I am this is something that probably should be fixed before more people are infected.
What happened is that Discourse has a “1-click upgrade” system that makes updating it easy. Except when it fails - when that happens all manner of chaos can happen. So I just manually upgraded instead.