Forum:Mass Effect 3 Firefight pack doesn't load.

Hello everyone. I just bought the Firefight expansion for Mass Effect on my Xbox 360 and now the game glitches out in the screen where it asks if you want to resume your game or begin a new one etc. It shows "Checking downloadable content" and it doesn't go away. I've tried deleting the Firefight pack and downloading it again but that didn't help. Does anyone know how to fix this?