Alright buddy. So every DLC until the last 2 of them I had to delete all data for MW3. This means if you have any campaign stuff or spec ops stuff you lose it. Then re-download all of the maps and let them install on the same screen. So do not DL in background but let it completely DL and install. And again make sure you always pick the DL all not individually.
I had the same exact problem though. Its annoying. So give that a try. If your intenets decent it doesnt take as long as it sounds. I did it while my kids were watching TV so it didnt bother me. I was able to switch the input, get it going, then back to cartoons for the kids. If I would have had to do it before I played I would have been even more pissedoff.
