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- Then I couldn't reopen the MIDI Monitor window: I got an error message 121 (screenshot below), and I had to close and reopen BiaB to be able to make another recording with the MIDI monitor enabled/

- Finally when I selected only MIDI Input ont he MIDI Monitor and made a new recording (only 28 notes were recorded before Biab stuttered and stopped), the monitoring window remained empty! However, the notes sent in MIDI from my keyboard were recorded as seen on the score (screenshots below)!

I'm not sure the orange message is related to your MIDI input problem. It might be indicating that a window is not on top when it should be, but let us know if you see it again.

Go to Options | Preferences | MIDI options and enable MIDI Thru (if not already) and then open the MIDI Monitor again and try playing your keyboard. You should see data there regardless of whether BiaB is playing/recording. Also, if you watch the 'pianos' tab of the Mixer you should see notes light up there .... do you?

Andrew
PG Music Inc.