If I make a change to the control points, APG doesn't indicate that the project has changed state (with a * next to the file name). Worse, APG lets me quit without asking me if I want to save!
Screenshots show: 1 - Initial state after APG has loaded and I have asked to edit control points. 2 - selected a bad link. 3 - added more control points, no change shown in status of project. I pressed the quit button in the main APG window and it quit losing my new control points.