Midi notes send Windows keystrokes when "all midi nputs" is checked

Hello, I came across a strange problem yesterday in Cubase 12. If the midi port I use has “all midi inputs “ checked in Midi ports configuration , pressing some notes on my midi controlller (I use a Yamaha synth and an M-Audio controller, same problem with both) seem to send Windows key commands : for instance, playing F3 opens the Library , as if I had pressed Ctrl-P on my keyboard ! Never seen this before, what’s happening ? Thanks for any help here !

Hi,

Double-check if you use any Remote Device in Cubase (Studio > Studio Setup). For example, Mackie Control. If there is any, what kind of MIDI Input does it use?

A few screenshots might be clarifying - picture, 1000 words, etc.