can't help... have same problem...
Delete the file missingdeps.idx in DCCache and see if everything is showing up again.
If that doens't help, you will probably need to reinstall ALL your store content
- Go to DCCache and move all *.ebc files to the desktop
- Delete the missingdeps.idx
- Now all store content should show as not installed.
- Reinstall everything BUT don't choose all of them. Do it in portions. The *.ebc files that are generated should not be over 200-300 MB in size. If you choose to many, you end up with files that are 1 GB or more. In my experience, the game doesn't like that too much.