Fixing to dive into Skyrim and put the game behind me. Thought I'd tackle this issue next. Using ENB series v0.292 and an ENB preset called Natural Lighting and Atmospherics.

When facing the sun, the ground surface as a whole exhibits an adaptation-like brightness inconsistency that is fairly subtle. (It is not in fact adaptation, since it happens instantly, even with adaptation disabled outright.) Sometimes the effect is not subtle at all, as shown here:

https://youtu.be/q4RZk0FIYS4

I can get this to happen consistently when facing generally towards the sun. As the camera tilts towards the sky, a mysterious shadow crawls out from below the field of view and positions itself about 20 feet away. As the camera tilts back, the shadow retreats. Disabling every effect I can think of doesn't resolve this issue, but disabling the ENB of course does.

Hoping someone knows what's responsible for this.

Skylighting artifacts i suppose.

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i5-4690k, 16Gb RAM, GTX 1060 6Gb, X-Fi Titanium, Win7 x128
I am INFP, not the brutal, godamnit.

This seems to be the correct answer. Outside of disabling skylighting, the only thing I can do to prevent the phenomenon is raise the AmbientMinLevel to 1.00, which seems to kill the intended effect. Lowering it to 0.00 also dramatically enhances the visibility of the artifact.

I know this artifact must be as old as skylighting itself, but I believe there's no doubt that it wasn't intended. Perhaps sometime in the future it could be investigated.

I've tried to fix it many times, but not possible without producing negative side effects of similar kind for moving objects or without big performance impact.

_________________
i5-4690k, 16Gb RAM, GTX 1060 6Gb, X-Fi Titanium, Win7 x128
I am INFP, not the brutal, godamnit.