So I got the game today and went through the "introduction". When I go to join my friend's game, it says I can't join because he doesn't have all of the same downloadable content. I opened all of the rooms of my sanctuary. My friend hasn't opened the armory yet. Could it be that he needs to download the 'Free Weapons Pack' first? He hasn't downloaded the Lionshead pack that came with the game yet either. I wouldn't think that would matter though. Am I wrong? Anyone else have this issue?