i have this problem as well, i cant play nuketown, jungle, crisis, cracked, or the first campaign mission the multiplayer maps dont work on splitscreen so it cant be my internet
Hey OP try these steps.
Go to your consoles memory> games> Black Ops.
There will be a game update listed in there, delete it.
Then put in the game and you will be prompted to download an update.
If that does not help then delete the DLC from your consoles memory and re download it from your download history. You can find that on your console under account management.
Or by using this link.
Hopefully this will help but if not I am sure other members will have alternate suggestions you could try.
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