Json errors in the Beta Supermon

Running the latest Beta on a Pi3+, running Buster. uname reports:

5.4.51-v7-asl+ #1 SMP Sat Aug 29 13:44:27 EDT 2020 armv7l GNU/Linux
To duplicate:

Configuration Editor > SimpleUSB-Tune-Control > Continue produces “Read Error - Try again”

:

Guess I’m the only one…