MIDI not working on instruments

Strange as all of a sudden the midi is not working when selecting instruments. I can see however that it is going through to cubase. Any ideas of what I can do asap as am in a session

Is the MIDI/Instrument track record-enabled?

OFFS! Pff, lol… nope… I forgot that I changed a setting in preferences so that I could edit whilst recording. It’s not a helpful selection at these times…
vic_france, thank you!