After Supernatural installation, game won't even start

I just downloaded the Supernatural EP and the problem is the game won't start up. Once I launch the game from the Launcher, I get a black screen with just my mouse for about 10 minutes. After that, it gets to the loading screen, and it starts to load but never progresses. It's just a gray background with the loading bar and the text "Planting Jelly Bean Seeds.." or something to that effect, and it never gets past this point.

I've tried checking for updates, but it says my game is up to date. I have the base game, World Adventures, Ambitions, and Late Night installed as well, although those were installed with a disc. The only thing I've found that seems to be a problem at all is that when I start the launcher, I get a script error as follows:

Line: 18

Char: 1

Error: Syntax error

Code: 0

URL: http://store.thesims3.com/api/user/balance?

           locale=en_US&callback=updateBalanceCallBack

It asks "Do you want to continue running scripts on this page?" I doubt this error has anything to do with the game itself loading since it just seems to be a problem with the launcher, but I'm just posting everything I can think of.