my collections keep getting deleted

Have you received any help on this issue? I am having the same problem. it is extremely frustrating!

Personally I would keep the Ultimate collection and get rid of Orgins. May not get as much but it would be nice to have the DLC on disc in case something happened to your HDD in the future or needed to delete the DLC to make room or space.

I deleted the marketplace system data and collection 1 and turned off xbox. Turned xbox back on and redownloaded collection 1 from recent downloads and loaded MW3 up. I went back to the in game store but just keep getting sent to xbox live marketplace and
dont get the message to download purchased content that is meant to redirect you to the download screen.

I've re-played the campaign mode 5 times already. The game keeps deleting my progress. I stopped. It's useless. And now I can't even get on an online multiplayer game because it won't connect to the server. The game is fun when it works (rarely) but right
now it's just sitting there collecting dust...

Although I haven't run into your exact problem yet, I have had a problem with downloaded collections: I've completed all the Cityscapes (one of the two free downloadable collections, Food being the other) puzzles on both easy and medium, but did not get
credit in the stats for completing a collection. I've also completed all the Food puzzles on Easy, gotten the Hungry for Puzzles achievement, but did not get credit for completing that collection, either.

Until I have a chance to fully verify that Landscapes and Wild Animals can be completed and that Cityscapes and Food cannot, I'm going to hold off spending my gold on the other collections, or will buy the cheapest one to start off with.

As part of my troubleshooting, I've played everything on Easy two or more times, so I've got some extra gold to burn if I have to delete and rebuy a collection.

Although there isn't a delete function through the normal user interface, I've looked at the user directory folder structure, and there are folders and files for downloaded collections. At some point I'll probably attempt to manually delete and then redownload
a collection to see if that fixes the issue I'm having.