Any help would be greatly appreciated. I upgraded to a new MacMini M4Pro.
Bb above middle C causing tracks/instruments to disappear. Same note 2 octaves higher also causing issues.
M-Audio Hammer Pro 88 is the controller - also new to me.
Also happening with M-audio key station 32.
Chances are that your keyboards (or āall MIDI Inputsā) are inadvertently configured as remote controls where some notes are interpreted as Cubase commands.