hope I can describe everything correct, because english is not my main language. To help I have attached an animated gif-picture. Unfortunately the drop-down-menus are not recorded. But no matter of this, I think you can still follow.
I have a midi-track connected to a Tyros 5 and only the channel number 1 is disappearing after choosing. When the mouse is over, the number appears, when the mouse is not over the number disappears. This is only with the channel number 1 and it is on the other tracks too. All other channels and “all” are shown correct.
Hope everything is described correct so you can follow.
Thank you in advance for looking after this bug.