If the Play button in the Audio Editor does not actually play your narration and the playhead does not advance as expected, you will need to update the sound drivers for your computer.
You may also encounter the following error message when this issue occurs (but not always):
"All wave devices that can play files in the current format are in use. Wait until a wave device is free, and then try again."
Although you may hear sound from some computer programs, this issue indicates outdated audio drivers for your system. You can visit the manufacturers website, and download the latest drivers to correct the issue. After installing the latest drivers, reboot your computer, and test your software again.