No audio output on mac os x

Evaluating Shotcut version v17.06 on mac os x
I have a video with that was recorded on another machine.
The video plays fine in VLC with audio being heard.
I start Shotcut
I add the video to the time line, the thumbnails are shown and the audio waveform is shown and looks correct for the video.
When I play the video, everything looks ok, and the ‘Peak Meter’ responds correctly to the audio.
However, nothing id heard via the Mac’s audio system.

Are there are settings in the application or Mac OS X that I’ve not yet found that enables the audio to be heard ?

Same problem here
Now May 2020 !

Works for me on all my Macs and rarely reported.