I'm having a glitch or something on the "Transcribe the Lexicon" part of Discerning the Transmundane. I follow the arrow to the doorway of Tower of Mzark and when I open the door, the arrow hangs there in the middle of the doorway. If I use the lever and go up to the mountaintop the arrow tells me to go back down. It's just stuck there in the doorway, but the doorway isn't one that leads to a loading screen, it just goes into the tower elevator, which is a preloaded area. I don't know what to do to get it to advance.
Am I just out of luck and won't be able to finish this quest?