I have the same problem with understone keep in Markarth, haven't even tried the blue palace and bards college. Have no clue what to do, started a new game to try it out but it is still the same. EDIT: make a copy of your skyrim.ini file (found in own documents, my games, skyrim), then delete the file and start the game; a new ini file will be created. If this fixes your problem too you made some weird changes like I did, if not paste back your old ini file and hope for another solution. iLargeIntRefCount=999999 this line caused all the trouble for me, can't believe it because this has been part of my ini file for a long time.