In the continuing drama of "as soon as you fix one thing, two more things break" I've had to disable the forums. Today I started getting alerts that there were php errors in the forums, and reports of infinite loops... I went to check it out and some of the forum subsections were... well, not working right.
Fortunately they haven't been used much. I say "fortunately" because it looks like the best way to fix the problem is "nuke and rebuild".
Anyway, forums are offline until I online them again.