cubase does not play the recorded channels

hi

Lately my cubase does not play the recorded channels (midi) only after I replace the highlighted channel
Do you have any suggestions on how to fix this?
Thank you

Hi and welcome,

Make sure the MIDI track is routed properly to a meaningful output (MIDI Device), please.

Also double-check the Preferences > MIDI > MIDI Filter, make sure MIDI Notes are not filtered out in the Thru section.