USB Microphone stopped working in 10.6.2

I have a CyberAcoustic headset that worked perfectly in 10.5 but since I upgraded to 10.6.2, the microphone stopped working (sound output to headphones still works perfectly). I checked the System Preferences Audio panel, the "USB Device" (which is my headset) is selected for input and the level is set to max. I tried it on three different machines, two of which were running 10.6.2 and one 10.5.7 and got the same result - 10.5.7 works perfectly while 10.6.2 doesn't. Are there any recommendations as to how to troubleshoot it and figure out what could be wrong? My uneducated guess would be that there's some device ID is missing in plist but I'm not sure about which one.
Any ideas?
Thanks,
JD

Hi JavaDuke & welcome to the forums...
Sorry if I missed it - did you run 'Audio MIDI Setup' (/Applications/Utilities) and see if settings there mesh with your current configuration expectations, etc....

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