Cannot shorten MIDI notes in Arrange

When I play the Main Track in the Arrange window, some chords are silent. In the MIDI editor, I see the notes are going on far too long, but the scissors tool will not cut the notes, and using the arrow to drag the note to be shorter doesn’t work either. I had this problem using S3 both in Logic Pro and standalone. Please help; this issue makes it unusable for my application.

2 posts were merged into an existing topic: Writing sixteenth note values in MIDI Editor