Found a problem last night...accepted a game invite but would not let me join because the channel was full. You select OK and it brings you to the "Custom Game" screen that you select to pull up all of the server channels. But when you hit X it does nothing, so you would think you could hit O and back out. Well guess again, there is no "Back" option and pressing O does nothing. So you have to quit the game and restart the game and do the whole process over, but if the channel is full it will do the same thing. Happened to me 3 times in row last night as I was trying to join our Black match last night.