Can't to add midi

[1khz@mail.ru]

Hi, if I try to add a MIDI channel with VST instrument - select midi port, VST-plugin, pressing an "Add track" button, and nothing happens. Also, if I select of instrument name ('Piano') on the midi channel setup page resets a selected midi input port! All it seems like a bug.
macOS 10.13.6, JamKazam Build 1.20 "1.0.3657"

[mabalot]

Are you clicking on "Add Midi Track". When you do, does your midi controller show up in the midi interface drop down list?

[1khz@mail.ru]

Are you clicking on "Add Midi Track". When you do, does your midi controller show up in the midi interface  drop down list?

Yes. I select it from a list.
If after it I select another instrument in the right side of the window, midi selection is resetting...

Or, if I then press "add midi track", nothing added.

[andyp]

ive seen it happen.

what ive done is 
reselect midi controller
reselect midi device, even if its selected

at that point the settings sort of cycle kind of blink like they are taking the new values

then save and its working.