Question

Why does the midi/instrument track get armed each time you click on it for editing? You have to click on the record button again to de-arm the track.

Answer 1

Above the left side of the arranger window, right above the word "arranger", is a small wrench icon. Click that wrench, and de-select "Instrument input follows selection" and "Audio input follows selection". I tend to turn these on when I'm tracking, and I turn them off during editing.