Yep, everybody else got this error, if they got anything at all.
It's too early to tell for sure, but apparently the server went down for quite a while, and that erased the forum's server settings file and its backup with it.
I made a new file and things seem to work now. If you see anything that doesn't work as it should, make a note of it here. If the forum happens to go down again, I'm #niffchat for a while, you can reach me there.