http://imgur.com/a/A1cDi

pressing f12 (my screenshot key) fixes it temporary (most of the time). it also happens without opening the menu from time to time, although I don't know what's triggering it (change of weather/time/?).

what's the cause of this? how can I fix it?

No idea. It's definetly not mod bug, so look for generic issues, like antiviruses, crapware, bad drivers.

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

better example:
http://imgur.com/a/MS4dN

how could I find out what's causing the problem except doing a binary search, which would mean having to uninstall as many programs as I have on my computer for an average-lucky search (1/2 + 1/4 + 1/8 + ...)?

also, why are you so sure it has nothing to do with the ENB preset or some other mod making problems?

a graphics driver update didn't help. this time, opening a book triggered the bug.

I don't know. Each day some new bugs reported, which was never happen all of the years before.

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

What are your system specs?

_________________
Embers HD
Smoking Torches and Candles
Particle and Subsurface Scattering Patches for ENB (updated 17/1/2020)
flickr

OS: windows 7
GPU: GTX 780
CPU i7 4770k
RAM: 16GB DDR3

So most likely crap in your system. Try killing all unnecessary processes in the task manager (i.e. almost everything that you can kill).

Also, do you have any other dlls hooked to ENB?

_________________
Embers HD
Smoking Torches and Candles
Particle and Subsurface Scattering Patches for ENB (updated 17/1/2020)
flickr

I don't know of any additional dlls. I guess I'll just reinstall windows as soon as I can and hope this fixes the issue.