OK, I think I have a workaround. I created a bookmark with only the track I wanted to work on, and when I selected some measures for midi editing the notes did get selected! It's not as grand as ...
Update: After saving work and re-opening the file, I get different odd results. Such as, select midi tool, selection flute 1, midi tool grabs violin 2 and trumpet 2. Sometimes the midi tool grabs ...