I am currently doing the quest "To Sunken City", and have completed it to the sub-quest "Under Lock and Key". I have defeated the first two floors of Norton's Tower, but the gate won't open to allow access to the third floor. My quest book says the next goal is to defeat Norton, my compass arrow is pointing to the closed gate, yet I can't continue. I have tried teleporting to the Commons then back, and even completely closed the client then re-entered, with no success. Is this a known bug or a freak occurrence? Also, any ideas on what else I might try? I am trying to stay logged on so that I won't lose my progress and have to repeat this dungeon from scratch.
Edit: I finally gave up and completely reset the instance. The second time through it worked perfectly and I was able to complete the quest. I still have no idea, though, what caused this issue or if there is anything else I could have tried to fix it before starting over from the beginning.