A friend and I were playing a 2v2 skirmish over xbox live and as soon as we switch from our party chat over to the game channel we can no longer hear each other. I tried pushing the right bumper and that brings up the chat display and the speaker next to my name lights up when I talk but we can't hear one another.

Has anyone else had this issue or know how to fix it?

I can only tell you someone else had made the same comment, and was corrected when it was pointed out you have to HOLD the RB down (for 360) until you are done speaking - otherwise the mic will light up as you talk because there is sound going into the mic, but its not directed at either the command network (RT) or your teammates (RB)...