USB Audio stopped working on 27" ACD after software update 1.0

Hi all,
My 27" ACD worked flawlessly until I installed 27-inch LED Cinema Display Software Update 1.0 earlier tonight. I have a unibody MacBook Pro that doesn't output audio from the mini displayport, when I got the ACD Friday, USB audio output worked fine. I also have a 24" ACD and audio worked fine on that as well. But after software update 1.0, I can no longer get audio output of the 27" ACD to work via USB, I even rebooted my Mac and it still doesn't work. After trying it a few times in Sound.prefPane, I now can't even select the "Display Audio - USB" option (when I click on it it reverts to the other option right away).
From /var/log/system.log, I believe this is the error related error message:
System Preferences[332]: Error ^P trying to set sOut device to 264
Message was edited by: ayn

I have this problem too. I have the 27-inch LED cinema display connected to my Mac Pro 1,1 via the Radeon 5770. I also suspected it had something to do with the machine going to sleep, but the audio doesn't disappear every time it goes to sleep. Unplugging the monitor fixes the problem.
I also noticed that when the sound has went away, if I try to change the volume there will be a long delay before seeing the volume-change graphic. Also, toggling the sound device in System Preferences while the problem is in effect is unresponsive, sometimes giving the beach ball. Finally, this message is seen in console logs when the sound has went away:
10/19/10 6:01:22 PM kernel USBF: 75053.200 AppleUSBEHCI[0xf3d0800]::Found a transaction which hasn't moved in 5 seconds on bus 0xfd, timing out! (Addr: 5, EP: 0)
I can make this message appear on demand by attempting to change the volume.
If (when) this happens again, I'm calling support.

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USB Audio stopped working on 27" ACD after software update 1.0

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