looking for some help, spent hours with microsoft and xbox support and no luck. . . i downloaded the game on pc to play with my friend on xbox, we played for a good six hours with no problems. loved the game! but not i can not join or invite to a game at all. i get the invite and accept it and nothing happens. NAT is open and connected, tried reinstalling the game, restarted the computer, microsoft and xbox remoted in and checked all kinds of settings and even helped my make sure ports on my router were open. still have the same problem. . . please help!