This has started happening to me today, it's super annoying and I can't figure out what's causing it. Update: After comparing load orders, I've found "headtracking.esp" to be the offender. I was being lazy and using the workshop Russian version so I shouldn't be surprised it ended up breaking. Hope that solves your problem. Update 2: Be sure to back up your saves and disable the mod using the MCM ingame first if you're using that. Had a corrupt save issue but thankfully I managed to fix it.