I'm playing the GTS collection with the 'GTS - Unofficial Visuals,' 'GTS Community Edition,' 'Player Home Overhaul for GTS' addons. At one point, all human NPCs in the game just became blue when loading a save. I'm not sure if it's missing textures, as sometimes the head textures will be normal for a minute before turning blue. It seemed to align with when Racial Skin Variance would load, and I tried disabling it and dependent mods. This led to the NPCs looking normal, but the game would crash soon after. I should note the PC was unaffected.
Picture of blue people:
Picture of head texture looking normal for a second:
Sometimes other textures, such as the torso, will be normal as well, though I don't have any pictures of these.
I hope me mentioning what collections I am using above is sufficient, I am not sure if there's any way to generate a modlist in a text file, and that would take very long to list out (2k+ mods total). I should also add, the blue people issue began before installing addons to the collection.