HELP! SUMTHING'S GOIN WRONG WHEN I LOGIN!

hey ppl, lately whenever i try to open up a page from one of the forums, for instance i tried to reread nitica_82' s fanfic on ak, i keep getting this pop up msg that i am not logged in and need to do so!!! this is quite strange as i have auto login and it used to work fine b4, so if not asking for too much can any1 help me here???? and tell me how to stop getting this pop up? thankyou in advance and looking forward to ur replies..