OSOK Darkness

Hey guys, I bought Halo 4 like 4 days ago, I used to play Spartan Ops normally, but then I downloaded the episodes 6-10 and now it only shows for me *Episode 1* but no chapters AT ALL. Like seriously, not a single chapter from all the 10 episodes. I deleted the Episode 6-10 update, and still didn't work, deleted Spartan Ops 1.0 and redownloaded it but still not working. I am completing everything on Legendary difficulty so I don't know if I'm required to deleted the whole Halo 4 file, and if it will erase all my saves !!! Please help...