yes this is a big problem...
for a expensive game like that its more than impolite to have so many bugs...
when theyll not be fixed in near future theyll lose nearly all players...
now to your prob ;D
uve done the following things???
1. save the key so that the game dont ask you for it from time to time... (when u join multiplayer)
or
2. join servers without ranking...
more i dont know about the prob because i can join every unranked game
itz an answer for ChaosADPumpkinHead
greetings uselezZ
(hope theres a solution for u

)