Hello all, first time posting here just wish it was under better circumstances.

I bought Dawnguard last week, booted up skyrim and played like normal. Then when I went back a a couple of nights ago I was greeted with a message about missing content. I checked Add-Ons and was told theres no add-ons downloaded. I downloaded Hearthfire last night hoping itd fix the issue, but unfortunately i got the same result. I dont wanna continue my regular game for fear of it breaking (clocked up 120hrs so far)

To fix it ive tried

• deleting dlcs and re-downloading them - no luck
  
• clearing cache - no luck
  
• switching gamer profiles - no luck
  
• deleted my profile and re-downloaded it - no luck
  
• deleting the game installed on my HD - no luck
  
• deleting the title update - no luck

Finally I tried deleting DLC and then clearing Cache, and that worked!! I loaded up Skyrim and the DLC was there and i loaded my game as normal. Then I turned my xbox off, turned it back on again, and loaded up Skyrim and you guessed it! The problem was back.

Im out of ideas and wondered if anyone else has experienced this? Or even better knows a fix!