Can someone please clarify exactly what is /is not happening so I can try to narrow my search.
I am right is saying that if you go to
http://www.thephotographyforums.com/forums/ when you are not logged in, then put your user name and password in the login box (top right) it then throws the error and tries to redirect you to /profile.php?
Also when it does this have you got “remember me” ticked so that the forums automatically fill in your name and password or not, and have you tried it both ways?