I have had this issue for quite a while and nobody seem to have been able to help me. It says that i am unable to play user created content. Why? I was told that i had to download the heroic map pack, and so i did. But it still doesn't work. I'd really appreciate some help.
Your family settings need to be changed. And yet, my Xbox won't let me change my Family Settings, even though I'm the master account. So, I wouldn't know too much about that.