So I've got about 60 hours on Skyrim now and it's started to say that whenever I turn in a quest that it's still an active quest and yet I can't turn it in again. (Spoiler possibly) Right before I noticed this I was doing the final quest for the Thieves guild where you must return the Skeleton Key and at the very end where you speak to Nocturnal and she disappears, Karliah is suppose to show up but instead nothing happens and I am trapped there. Was wondering if either of these things has happened to anyone else and if there is a way to fix these problems?