If it still happens, trying taking all your hacks out, heck, you could even temporarily move your downloads folder to your desktop and run the game (just don't save anything) and see if they still jump or are missing socials. If not, it's something in your downloads folder.
Fishing out hacks can be a pain sometimes. Some of them can sneak in with other files like houses, and not all of them show up highlighted in red in clean installer either.
Yeah, that's actually what I did. I just moved my entire hacks folder to my backup directory and the socials came back. They're still jumpy though, so I need to go fishing again. To my knowledge, all I put back in were appliances, kitchen cabinets and some jewelry and plants. :-P What a pain! I was trying to put back in small chunks of stuff.
C