Shrubbing Playhead / LIVE Preview

I recently upgraded from MX 2004 to CS3. And I do a lot of sound/lip syncing, and I like to scrub the play head and hear the audio in realtime, also just previewing the Flash by hitting enter.

Well…this isn’t happening in CS3. When I scrub, there is no audio. And when I hit ENTER (not control/command + ENTER), it starts playing the flash video & audio…but the audio doesn’t stop until the end. Very annoying! I can’t stop the audio at the place I want to stop.