If the Default Midi Editor is set to ‘Open List Editor’ or ‘Open In-place Editor’ in Preferences/Editors, clicking on a midi part does not open the correct editor - it always opens the Key editor.
If the default is set to ‘Open Key Editor’, ‘Open Drum Editor’ or ‘Open Score Editor’ it operates as it should.
How come is this now broken??
Set the Default Midi Editor to ‘Open List Editor’ in Preferences/Editors then double-click on a midi part.