If a change causes a problem, undo the change.
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Welcome to the forum.
Did you install any drivers with the USB mic? If so, chances are that these smurfed something in your Audio Hardware settings in PrPro. Look especially at your ASIO settings now. My guess is that you will have some additional choices in the drop-downs.
Now, USB mics are prone to problems in most Adobe software. Some function OK, but others just do not.
One thing to try, would be to download and install ASIO4ALL. It's free and has fixed so many ASIO problems for others. You will have to point PrPro to use it in all the drop-down boxes. After you install it, reboot, and it will appear as a selection. Many on the Audition have used it to allow for the use of USB mics and a ton of other esoteric equipment.
Cheers for the help guys.
It seemed to sort itself out, not sure how or why but it did..... I took the mic back anyway, it was pretty crap :-(