When i go to the multiplayer menu i get an errormessage on a blade appearing from the right which dissapears too quickly to make out, the i get kicked back to the dashboard.
Singleplayer works fine (haven't tried it long though), multiplayer for other games like gears, graw and tabletennis works fine.
I have a PAL system, the game is region free import and says PAL on the box.
Anyone have an idea what the problem might be?

i cant join multiplayer games either. wont let me connect to any hosts. kinda like the GOW problems except i have no problems with GOW... annoying =(

i cant connect to any fukin multi games either it says no games in session im like wtf only worked like once

if any one is having problems PM me with your set up. MODEM/ROUTER/PC/360 i should be able to help you out!!!

I can connect normally as if to say to multiplayer though seems there is a problem with RANKED matches... my ports and NAT are opened so no problem from my side. Shame as well that if I play COD3 it freezes a lot and have to reboot manually the xbox most of the times. Hope these bugs will be sorted soon since its a shame one of the best games out with still loads of bugs.