When I play Black Ops, whether it's a wager match, domination or any game mode, and I'm in a lobby which has selected nuketown or firing range as the chosen map.
It loads up the game for a few seconds, like any other map, but ALWAYS kicks me out during the loading process.
It then sends me back to the multiplayer homescreen and I get the error message: "
Downloadable content has changed"
I don't know why this is, but since I have bought my xbox over a week ago I have NEVER successfully had a match in either of these 2 maps.