Okay, I deleted all the stuff Rica told me to delete but no luck. I started a new game entirely (as in, restarted computer, opened TS3 fresh, started a new file) and it was still a mess. I was in CAS and that weird thing happened where I picked a different outfit for my Sim, and it looked like it was made out of skin. It was in the shape of the shirt I picked, but... yeah, like it was made of skin. This has happened three or four times since installing UL. I've only seen it in that Sims Gone Wrong blog before. Now it's everywhere. Is this glitch particularly indicative of something?? I would have taken a screenshot but it froze promptly and then I gave up for the time being.
I did not delete the world caches or any of the crash logs.
Seabody-- no I don't use any CC that isn't from EA, nor do I use mods. I do, however, use cheats... but I didn't think they carried over game-to-game or file-to-file. I have had some weird things happen during my Sims3 tenure after using too many cheats during a session, but as I said this test game I opened was totally fresh in that regard. I went right into a town and into CAS, no time for cheats. I'm finding the whole thing kind of weird.
As for my OS and computer, I pretty much have the best Mac Laptop money can buy so I don't THINK it's that. (15" rMBP, 2.6GHz Intel Core i7, 16GB RAM, Intel HD Graphics 4000 512 MB) It could always be something a bit whacky; just because it's fast and clean doesn't mean it's perfect. I simply think it's unlikely to be a computer issue given its newness and how well it works. The only thing that's frustrating about my computer is that it loves to have kernel panics. I know a bit about computers but not that much... do either of you know if all the kernel panics/errors could be likewise indicative of a problem? It probably happens once every 2-3 weeks, but doesn't seem to have a huge effect once things restart. I think I've read that kernel panics are more common on OS Mountain Lion than any other of the Mac OS, but I still don't really know what they actually mean.
For what it's worth, TS3 worked BEAUTIFULLY up through Seasons on this machine. Things maybe got a tad bit glitchy when I installed 70s, 80s, 90s Stuff but nothing like this.
Is there any chance this could have something to do with Union Cove? It has never really worked right for me, despite having all the EPs/SPs/general crap I need (I'm pretty sure). I have every EP that's been released to-date and the only SPs I'm missing are Fast Lane and KPST... I think Fast Lane is the only thing I don't have that I'm relatively certain is contained in Union Cove, but somehow I doubt that is the genesis of all of these issues.
What are my next steps here? :/
Thanks so much for the help already, and thanks in advance for anything else either of you can tell me.