No, he's talking about Balefort, in one of the first rooms, there is a floor that you can't see, right from the start. You have to walk on air. But if you rotate the view, you can see the floor. I know because I have been levelling Snakespear (no final e) in there the last few days. It wasn't as bad before as it is now. If I see it again, I will give a more exact description. It does seem to be a bug.