My audio alerts stopped working in JTAlert, too. 2.15.2 on Windows 10 pro 1903
I have tried the following:
* change the sound card, exit jtalert, change the sound card back (to "Speakers (high definition audio device)")
* DX keeper and system sounds are configured for "Speakers (high definition audio device)", Joe DX talks, windows dings wor
* uninstall jtalert, delete configurations, re-install. still no sound.
* task manager shows JTAlert V2 Alert Manager process is running
I sure wish I could make it ding and talk again.