Playback in superspeed

Hi -after downloading the latest beta release of 4.0 about a week ago the playback went bananas (the releases before that worked just fine). It now plays back in superspeed (like fast forward on a Tape casette).
Someone mentioned it could be related to Logitech drivers. But since previous version worked OK I guess there could be something else going on.
I have a pretty standard setup:
Audio card: onboard Realtek soundcard
(Mouse and Webcam= Logitech)
All drivers are updated.

Anything I can do? - I allready tried uninstalling - reinstalling without success