I have researched this with a lot of Google searches and I can't seem to find my particular problem.
I can't use the engraved adra disc to get into the dungeon @ Stormwall Gorge. I know I am supposed to wait until night. I do so and the option to fit the disc does not appear. Therefore the Main Quest is broken and I can not proceed with the game.
Another strange thing, somehow I have two discs in my inventory. Since I can't remove quest items I can't tell if the first is some kind of bug.