Latest Windows Threshold Build, th2_release Core 10547, "borked" my audio on the desktop. Had to go to Realtek's website and download new audio drivers as a result. Also, had to re-enter my serial number for the WebcamMax program. For some reason, it vanished after the new build installed.
I know these builds are beta and subject to bugs, but I like "tinkering" from time to time.