My apologies for the delay and your understandable frustration. We are
in the middle of moving offices across town, so things are very hectic,
and connectivity is not reliable.

As for the specific problem, this is a problem we are aware of. The
developer is looking into a permanent solution.

In the meantime, when you get to the Save Movie Dialog, click on the
Settings button in the Audio panel. Then simply click the Okay button
to dismiss the dialog, and then go back to the Save dialog and save out
the movie.

This should get audio to save properly.

Let me know if the problem persists.