Now I take 2 steps back and go down the first 2 stairs and......... As I move back and forth the greyness actually fades out and fades in along with the HDR lighting effect (or whatever witchcraft Bethesda use for the lighting effects).
I went to BleakFall Barrows. And I am seeing the same effect.
But indeed, only at that spot. Standing on the stairs leaving the first room.
I've ran through the whole dungeon, looking for the same effect. In 2-3 spots, I could see something similar. In very long corridors, I would see that the very far end would be the same kind of grayish. But it was hardly noticable, and it would not be irritating at all.
I don't think it's a glitch. I think this is how the technology is supposed to work. In any engine, they try to limit the amount of computation that is needed to render stuff that is further away. Detail draw distance. Shadow distance. Etc. It's just that in this spot in BFB it is very noticable. I hadn't noticed it earlier in the game (and I got 250+ hours played).
Also, it is a natural effect of the eye to see less clear colors for stuff that is far away. Painters do the same thing in their paintings. Stuff that is far away gets more and more grey. Videogames have been doing this since as long as I can remember.
Maybe the OP had changed some settings to change the distance of this effect ? Cinco, had you tried with original inis (without tweaks) ?
Anyway, I'm happy for you that that addon fixed it for you.