On a macOS Big Sur here, running the 4.9.6-version. Seems I can´t edit the midi like I used to? Entering the midi editor, but X doesn´t remove my rouge note. I can move it and extend it... but no deleting? Also seems like I can´t add an extra note?
But the most frustrating part is that the whole midi-info seems to be gone when I leave the Editor!?
SOLVED: Something strange with the midi-file. Saving a copy of it was the solution.
Might be something wrong with this particular midi-file. Which doesn´t seem to be possible to uplad here either!?