So, I just completed the Thieves Guild chain with the Nightingales. When I left Nightingale Hall for the last segment in the Dwemer ruins, the stone blocking the entrance was back. I assumed it was just a temporary bug and fast-travelled away. When I returned later, the stone was still there without any apparent way of removing it (lever, spell, chain, etc).

I hate not being able to access places I should be able to, does anyone know of a way to get that sodding stone out of the way without loading a savefile prior to the NPCs opening the place up?