[Staffslug] Phpbb Help

Howdy! I know this isn't really Linux, but I know there's a lot of very clever people on this mailing list, so I come to you for help :o) My question is.. I've just updated a phpBB from 3.0.4 to 3.0.5 using the automatic update, everything went ok, but now I have no main index page.. All the posts are still there, and everything is searchable, just no main page.. Strange. Anyway, if anyone can cast any light, I would be most grateful. Dave