Playback clears selection
Select one or more notes, then click the play icon. As each note is played, it gets deselected. There is no reason for it to do that, and it produces frustrating results. For example, select a note to begin playing at and press Play. Now decide you want to hear it again, so press Play a second time. It jumps back to the beginning of the score, because the note you clicked is no longer selected.