Just an anomality…
When zoom focus is set to mouse, and I click the [-] or [+] buttons, zoom uses the playhead position. This makes sense since the mouse is not in the main window – it is busy clicking.
When zoom focus is set to edit point, and edit point is set to mouse, the [-] or [+] buttons and View>Zoom>Zoom in/out do not seem to function at all. Using the ‘=’ and ‘-’ keys still work (as long as the mouse is in the main window.)