Server Version#: 4.100.1
Player Version#:1.36.1.3638-68ff8a18
This was going to be a call for help until I came upon this in the log file,
[MPVPlayer] Property ‘volume’ = 0
I found the corresponding line in the config file, changed that to 100, and now I have sound. The question remains, why on a new install was the default audio player volume set to zero?