Assuming you got your in-game issues worked out (right?), for the moment I'm thinking your forum issues are just a matter of a little glitch.
If you see yourself not being logged on the forum, when you are, I'd suggest logging out of the forum, then logging back in. Sometimes your account will "time out," which can cause posting issues, and various other blips. So long as it's not preventing you from performing any tasks like posting and voting on the forum, etc., then I don't think it's too much to worry about.
(I do suggest looking into the tips Thrillex suggested above, though, since they may also help quite a bit).