Legend11 on 07 September 2013
@OP
I think this is a bug in which only the original profile that installed DLC has access to it. I'm guessing the 360 you're using has multiple profiles and if you tried playing the game with the other profiles you'd find one that would allow you to get past the point you're stuck at.
This issue should have been fixed with one of the title updates so if you haven't tried updating yet you should to see if that fixes the issue. If that doesn't work you could try deleting the Halo 4 game install and DLC and try installing the game again making sure you're logged into the profile you wish to play the game with.
