Hello all,
I am having problems playing online co-op with my friend.  I try to join him but get a message that one of the games dose not have the most updated content.  We both are using Xboxlive and have downloaded everything for this game.  Any ideas as to what is going on? 

No idea.
But something fishy is going on cause I used to be able to play keys to the city with people who didnt have the content downloaded.
What I mean to say is that it used to be that all you needed was one person who had it.