I have used CQ monitor audible alerts on my Mint 18 for several years now for both WSJTX and JTDX, and it has been perfect. All four sound selections worked.
I just changed to a more recent distro (MXLinux 19) in order to run WSJTX 2.2.2 and JTDX 2.2. Everything is working again including all features of CQRLOG interfacing with WSJTX (and JTDX), except there are no sound alerts generated. All settings are the same... the voice_keyer script is identical and is executable. The .wav sound files all play correctly. The address is 127.0.0.1 port 2237 for CQRLOG and matches WSJTX. UDP is enabled. I have changed OS and I have changed the versions of WSJTX/JTDX, and the log is empty, so all CQ calls are green and 'New' , otherwise everything else seems identical. Any idea where I should be looking for the problem?