Can't get video production software to recognize USB mixer board

I'm using my new iMac 27" with dual quad Intel i5's to run streaming video to Ustream for a video program. I'm using Wirecast production software. Previously I had an Alesis USB audio mixer, which worked fine until the mixer itself developed a problem. I replaced it with a similar Behringer USB mixer.
When I open the Wirecast video production program, it tells me that it does not recognize the USB video codec. I've posted this problem on the Wirecast forum, but all they can advise me is that there may be some other software that is grabbing hold of the USB video codec before I open Wirecast, and only one piece of software can use the USB video codec at a time.
I know that the signal is getting to the computer via the USB input, as I can hear my microphone tests with headphones plugged into the computer via Garage Band. However, the sound is distorted, a little high and tinny and perhaps doubled.
I also have Ableton Light loaded onto the machine, though of course I do not have it active when I'm running Wirecast.
Three questions:
1. How can I make sure that nothing else is trying to use the USB audio codec before I open up Wirecast? Is there anything else that might be causing the problem?
2. Assuming I have all the effects in Garage Band completely turned off during the mic tests, what could be causing the distortion?
3. Are there any websites/books, etc, with beginner's information about using audio equipment with the Mac? I know a bit about audio, I used to use tape-based four-trackers to record speeches and I've done some time in serious studios as a performer-- but digital-based recording is fairly new to me.
Many thanks for all help. J.Beau

Log into another user account on your Mac Pro, connect one of your devices via USB and launch iPhoto. Is the device recognized?
If not try booting into Safe Mode, Mac OS X: Starting up in Safe Mode and run the same test.
OT

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