I'm having problems with Left 4 Dead 2 (can't get either Sacrifice or Passing to work, both show "unsupported or corrupt downloadable content"
I had similar issues with Borderlands, and worked out eventually that because I was using a GOTY edition disc with 'Standard' DLC it wasn't working, popped in the 'normal edition' disc and it worked fine.
Currently I've checked Left 4 Dead 2 and seen that my disc has the media ID 0E79403B and my TUs are using the same media ID - and the 3 new episodes show up on the title screen / level select so the TUs are working, all I can think is my DLC has a different media ID it's locked to possibly? I tried using Yaris to clear the console ID and it didn't fix it.
Is there a tool that will show which media ID DLC is compatible with?