Buttons were only working for GR-KL, but not for other devices
implements #18539
@chhitz I fixed the regression and restored the old behavior, but Wolfgangs comment suggests that call scenes were wrong in general, however we always had an explicit call scene implementation upon INC/DEC for GR-KL. See http://redmine.digitalstrom.org/issues/18539#note-4 and http://redmine.digitalstrom.org/issues/18539#note-6
Maybe you could follow up on that...?
P.S. I noticed that when I issue an INC/DEC scene call on a GR-KL and read back the value, it's either 255 (after inc) or 0 (after dec), I believe this did work correctly before, i.e. the value changed in steps... it's not a UI issue. I wonder why this is happening in my setup ?