Some of our guys cannot get into our BT server, getting an invalid cd key message. They all have valid keys...no pirating. They can get onto other BT servers, but not ours.
I've heard of a line that must be added to the server.cfg file, or to the executable.
The reason I think that would happen is if you guys shared BT and sent a copy to each other and used the same CD key. I know in an old clan I was in that happened. But you said you didn't so I am clueless.
p.s. don't expect to get any CD keys either