User blog comment:Jimeee/Skyrim 1.9 beta update adds Legendary difficulty and raises level cap (Updated Apr 8th)/@comment-86.7.238.63-20130309185948/@comment-7055147-20130309210208

To get the Thieves Guild progression going again you HAVE to finish the special job all the way through to completion. Once it is done you will be able to sell the rare items, turn in quests, etc.