Firefox has detected that the server is redirecting in a way..
 

That will never complete. I'm getting this message after I login to a forum I think they're using joomla. Nobody else on the forum seems to have this problem, and it works on my mac at home but every other computer I try, such as my windows laptop or other peoples' mac's, give me the same problem. Any idea how I can fix this?

I know that cookies are not blocked.