Custom Content Uninstalls Itself Every Time I Open the Launcher

I just downloaded the Late Night Expansion pack from Origin. I had to reinstall the base game and it was a huge ordeal. Anyways, now, when I try to play the game, none of my storebought custom content appears in the game. I've tried deleting it, redownloading it, and reinstalling it. At first it will show that it's installed, but then, when I play the game, it disappears and doesn't show up in the game. Even if I install the content while I'm running the game, from the launcher, it says that it will appear in the game but then it doesn't. The content that I downloaded for free from TSR and other sites all stayed downloaded, but none of my official Sims 3 content is working. I've been at this for 6 hours and nothing seems to fix the problem! HELP!