I need help

[Cocain]

Perhaps you're on a 'a' version of a patch, when your mates or server is on the 'b' version.

[MikExV™]

Your realmlist could be wrong. Set your realmlist to

set realmlist 127.0.0.1

or replace the 127.0.0.1 with your external ip. If this doesen't fix it then its a patch problem like Cocain said.