I've found a couple of bugs which aren't in-game as such... sort of.
Problem It is possible to create a password for your account which doesn't work in-game.
Reason The site accepts symbols in the password, but the game doesn't allow them.
Problem: Unable to post for forums even though logged in "You are not authorized to perform this action.
Reason: Actually, this is one of two things and I haven't bothered checking which. It's either:
a) Logging in without allowing third-party cookies means you can't post without logging out, allowing them, then logging back in.
or (and I think it's b)
b) You change your password. You can no longer post to the forums without logging out and back in again.
This was done under Windows XP SP2 with Firefox 1.5.1