So, I hadn’t actually tried to use any external midi devices to control my A42 in the standalone… until just now… and I’ve got the same problem!
All I did when I fired up the standalone was to check it recognised midi inputs and then I went straight into using the A4 vst in Ableton…
I’ve just spent the last 15 minutes going through every single menu on the A4 and tested by trying to send midi notes from both my Novation Impulse and Korg Minilogue and neither of them are working. It worked perfectly with A42 firmware 1.36_BETA2 & Overbridge 2.0.21.21 but not anymore!