For some time my game has pixelated textures and missing/misplaced textures on some objects - making them pure-white or weird. Pic is from Clean GOG Version. Now I cant even use mods that were working before.

Any help?

Did you check in the options whether the texture quality is set on highest? If so, try to change it to lowest and save the settings. After that bring it back to highest and save.

As for the mods, what do you mean precisely? Mods don't load? Do you get some kind of message? What mods are we talking about?

Thanks, somehow I totally forgot about that being a thing.
What I wrote about mods, I meant facelift mods and textures/models replacements. Not as Story/Game Modules.
Sorry about that. They do work again - by the way.