I noticed with some recent builds that the HB + ACK functionality works as expected, but if the HB button ACK is selected to be "On-demand" the "ACK" no longer shows up in the button (it only appears as "HB", not "HB+ACK"):

If I select an HB timer, the "ACK" does show:

This behavior is repeatable on both Windows and Linux, built with the latest "master" branch from https://github.com/chris-ac9kh/js8call-improved.

73,
-Joe-
K0OG