The rebuild is going alright, slowly but surely. I've had a few instances of sims jumping and losing freewill, something I haven't seen since Seasons first came out. I've organized my downloads somewhat since, and removed anything that I hadn't used ongoingly. I found an old thread in which Numenor mentioned custom careers causing this bug, and how they can piggyback along with lots. I didn't download any custom careers, but decided to check anyway. Lo and behold, I had two of them in there, one being the Castaway entertainment career track. This makes perfect sense, because the glitching first arose after I got two sims jobs in the entertainment field. It could be coincidental, but I hope that fixes it. Another thought, is that it might have something to do with the quad core processor, which the game was not designed for.