Forum Problem while logging in

Every time I visit the forums, I get greeted with the following message right after I successfully log in and while the message "thank you for logging in" is on screen. It gives me the message right after it tries to redirect me to the actual forums:

Forbidden

You don't have permission to access /forums/forum.php on this server.

Additionally, a 500 Internal Server Error error was encountered while trying to use an ErrorDocument to handle the request.

If I refresh the actual page then I can see the forums normally, I just don't know why this message keeps appearing.

Strange. Anyone else getting this, or is it an isolated case?

Sometimes I do get it as well, but refreshing the page always brings me to the correct forum homepage..

Occasionally, yes.

Just a bit more information, the url that appears when I get the message is this:

http://www.goldhawkinteractive.com/forums/forum.php?

If I just refresh I get the same "Forbidden" message. If I remove the "?" at the end and load the page, the forums appear.

Hmm, ok. Doesn't seem to be serious enough for me to warrant poking around to fix, I'm afraid. I've got better things to do and I might end up making the problem worse.

Yeah it's not really a problem, more like a mild annoyance.