Whether they fix my problem or not, I found another reason to switch back:
http://imgur.com/gallery/I8u2G
Even if I disable all of these privacy settings, they are apparently reactivated by a Windows Update according to the commenters... I don't think I want that.
Edit: Now another poster is saying some of the information is incorrect and a lot of people are overworrying. I don't know. I'll keep it at 8.1 for now.