Yes Jim, I open Edit Video Advanced. Videowave opens and I add video. No warning comes up about AC3 audio. The source files come from my sony camcorder and, as I said, files that I had previously used in Creator 2009 to make successful DVDs play with no audio in the preview pane of Videowave on my new PC with NXT Pro. All of my files play perfectly well with audio in Windows Media Player, so I know the audio is there.
I have checked that the volume is not muted in Videowave.
In the Production Editor Timeline View at the bottom of the screen, I show Internal Tracks - Native Audio and there is a green line. When I click on this, Audio Editor opens and I can manipulate the green line but still no sound coming out.