I was up the lighthouse for the wailing banshee quest but I can't get out anymore, while the door is open it was not meant to be crossed:
http://steamcommunity.com/sharedfiles/filedetails/?id=419048797
This happened only after the patch though, here is my save file and system specs : https://drive.google.com/folderview?id=0B0LtqflWhvf1anVPMzA5ZU5aLUk&usp=sharing