ITunes won't recognize speakers after Leopard installation!  What's wrong?!

After I installed Leopard, I noticed my iTunes wasn't recognizing my Harmon Kardon sub connected via USB. This sometimes will happen, so I did what I would always do to fix the situtation - restart the computer. However, this also didn't work. So I tried another solution, plugging in the speaker with a song playing as this would also work when I had this problem with OS 10.3.9. However, with Leopard, the song started to break up as the sub tried to come on, but couldn't. Then, when I hit pause, not a single song would play! With the sub connected or not! I would have to restart my computer to get iTunes to work again. This is same, new version of iTunes I was using with Panther and I have installed all the Leopard updates and am still having this problem. Anyone know what this is or how I can fix it? Thanks!!!

I think it is a QuickTime problem. My 10.4.11 mini just lost its iSub after the QT update.
The amusing part is that when I select the headphones as sound out, the iSub shows up and actually plays along. When I choose the USB speakers, iSub disappears.
Sorry I don't have a solution at this time. But you now know that you are not alone.

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