I tried a lot of different setting and presets but I can't get rid of some strange square around the sun in my skybox (the sky looks a bit brighter in this square). Don't know where it is coming from. Tried different versions of ENB en settings but so far its still there. Anyone here has an idea?

I would love to post some screenshots to clarify but that looks 'spammy' according to the forum

Have you tried removing the stuff in data/textures/sky? Rename or move the folder for testing purposes.

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I don't even have this folder. So seems that can't be it.

If you don't have mods which modify sun, then it's driver bug or some software running on background.

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

This got me in the right direction. Noticed I don't have this problem when I switch all mods off. So than just switched the mods that influence graphics on one by one. Turns out its a problem with 'Climates Of Tamriel'. But I would really love to combine this mod with ENB, so the big question now is: what exactly goes wrong and is there a way to fix it?

Just for the information I'm running Skyrim on a Radeon 7970 on the latest drivers. Strange thing is that I seem to be the only one having this problems while I guess a lot of people run this combination

I don't know anything abot CoT, but many users here know how to fix this, so wait or ask again a bit later (or may be on skyrim nexus in official CoT comments). Also you may try to replace sun texture by custom, google it. Anyway, i don't know why nobody yet wrote about same issue, so prefer to think it's not just CoT.

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