How do I Fix the DLC? I just donwloaded the most recent faceoff DLC - HELP! (XBOX360)

The maps are on my HDD, but I cannot play them. Whenever I try to start a private match (for instance) on one of the new Faceoff maps It goes to a black screen and then I get booted to the main menu with an error (5 - Out of Memory)

Any ideas? Any help would be appreciated. IW needs to fix this bullshit ASAP, I didn't pay $50 for a service that doesn't let you play the shit you payed for...