I have a similar problem.
I can log in my FB account, use every feature without any problem. But for 1 week, it is impossible for me to open my "requests". The page does not load at all. I tried to change the browser, tried Opera, IE8, Firefox. No change. I tried to change the computer, tried from other computers. No change.
The strange is that from the same computer, same browser, my sister and husband can open their accounts and "requests" without any problem at all. IT is only my account which has the problem.
I cannot add any friends, I cannot accept / reject any request. :-(