I’ve gotten this message twice now when i try to do a campaign mission. The screen goes black and a small, red message in the top left corner reads “untracked build” and something else that i can’t remember. Cannot access or something like that
This happens when playing during installation.
It’s not installing or updating though 
i was just playing. And now i can’t resume the mission. It was on legendary and i really dont feel like doing it again…
Same thing here, half way through a legendary and can’t resume… I am really getting fed up with the MCC! it seems so buggy which i could deal with if the multiplayer worked!
I have only had 2 matches out of 50 odd attempts and the playlists are so limited. Poor show so far 343, think it was rushed.