See, the idea was that in specifying that they didn't alter anything, it would get the point across that they don't alter anything.
I removed everything I've downloaded since I first got and "fixed" this problem and nothing changed.
Initially, when I got it, I removed EVERYTHING. And it was fixed. I put half of it back. Still fixed. Half of the rest back. Still fixed. Etc. Until I narrowed it down to one folder, and I simply never put that folder back.
Now, a week later, it happens again. For all I know, that folder that appeared to cause it didn't do anything, and the only reason it was seemingly "fixed" was because it isn't a constant thing.
I've removed everything downloaded since then and the problem came back. It happens after quite a long time so it isn't like I can really test it- that would require hours of play without anything installed to possibly see if it stopped. It's not a constant thing- often it is fixed just by reloading the lot. It isn't as simple as removing things and testing it. That would take days worth of gameplay.
Edit: Found this:
http://www.simbology.com/smf/index.php/topic,15.0.htmlWhich seems related. "fixes a very strange issue where the game would not generate an attraction score if the sim's ‘target' was sitting or laying down" However, it didn't do anything. The game was fine for a few minutes but it started acting up again.