No Sound After iTunes 7.3.1 Update

I updated to 7.3.1 yesterday. Now I have no sound when I play music files. Here's the symtoms:
1. Music tracks play in iTunes, but no sound. No sound on internal speakers or remotely through Airtunes.
2. TV shows (and videos) play with sound.
3. Sound works in all other applications, including Quicktime.
4. I have made sure to deselect audio enhancer in iTunes.
Any help? Anyone have a similar problem?
This is a big deal to me. I think it's fair to say that I don't have a hardware problem since all other programs are able to use audio. Also, it is interesting that Quicktime can get audio from the same track from an iTunes library.

Did you restart after repairing permissions?
http://docs.info.apple.com/article.html?artnum=300832 Mac OS X: No audio from certain multimedia content
Trick/Tip: Open up GarageBand if installed then, open a program (optional).
Quit out of the GarageBand app.

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