Did reboot few times..no luck. Actually I got a friend who did the same steps, in BIAB with Vista:
"I wanted to reduce the audio track volume, so I went to audio/edit audio/adjust output level of audio (quick). A new window popped up, showing the volume 127. I typed in 75, that i left the pan centered, and than when I hit playback, I se that Not only the audio sound was lost but also the BIAB track. No sound at all.No Midi , No Audio, Nothing!
?????????????