3
Yes, I can still get to the admin area and do everything else. The forum is broken nomatter how I'm logged in (or not logged in). I tried all the debug modes, but received no error message.
I've also noticed that the Recent Topics (Message Boards) block has disappeared from the front page.
I added a new Topic, just to see what happens, and it added ok. But I cannot go into that topic either. I even tried repairing the forum tables in mySQL. I can't think of anything else to try.