When I go to the server menu and click on the refresh button (server tab) it tells me it can't recognize, or can't validate my version of the game. I'm guessing it's because of the cd-key.
So for now, i can't play on servers.. and that's like missing out on the whole game... so what do you think the problem is?
P.S. - if the problem is the cd-key i entered, what cd-key should i use for it to work and how do i change the key w/o having to delete the progress i made in single player?