There are several fixes in the link i am about to provide, your not the only one who has had this problem. I myself have not been able to connect once or twice and for me it was my directX level, try these options and if it doesn't work let me know and i will see what i can do to help.
http://www.edge-gamers.com/forums/showthread.php?t=185194
*edit*
changing your directX level will change your graphic settings..
ok, i got the map from gamebanana. do i extract it, or do i simply move it into the folder?