Tom --

My apologies for delaying this response for so long.

I solved the problem last night after a deep and detailed study and technical analysis. It turns out there was a toolbar at the top of the screen with a speaker icon that said "0%" when moused over. After moving the slider bar over to something like 60%, the audio worked as it was supposed to.

I don't know if that toolbar is an Apple OS thing, or some add-on. SWMBO is terrible about adding things. If it strikes her fancy, she'll just click on the install button without regard for consequences. If she had a Windows machine, it would no doubt by now be completely dysfunctional.

tanstaafl.