I'm not sure if this is the correct place to post this or not but here we go...

I click on the multiplayer option and it takes me to the chat room or whatever. I then click on a game that someone has started and go into another room with the other players. Once the host starts the game I am kicked out and back into the game menu and my game freezes. Any ideas on this?

See the "Crashing Multiplayer" Thread. Especially the last 5 posts or so.