I have the keystroke A set to "Go to Thru". I've had it set for months. I use it to move to the end of a selected loop section, most often used in PRV. However, when I use it recently, "A" instead Arms the current track for recording. This was apparently the default keystroke assignment for A. When I go into Preferences > Keyboard Shortcuts, however, A is clearly bound to "Go to Thru", whether I am looking at Global Bindings, or Piano Roll view, or any other area. Then I click OK and A seems to work fine again - exactly once. Then it goes back to arming a track again. Why is this happening?