Ray, this may be coincidence but FYI - I had a perfectly functioning GSX until 3-4 days ago when I suddenly lost all sound. I don't think I made any changes to my system except experimenting with some nvidea profile settings (which I reversed, and the sound did not return). In the meantime, GSX offered me an automatic update as it often does. I did that today, and the sound was restored. Perhaps you've got some 'in-between' version installed, though if so I'd expect you'd be getting the auto prompts to update as well.