I just noticed today when flying my Evo Pro 2 that in Advanced Settings, the Downward Vision Positioning toggle is disabled. After I attempted to enable it (slide the toggle to the right), the change wouldn't be retained. Other than an "Inaccurate Homepoint" message appearing following launch, it performed perfectly. RTH was right on the money and everything appeared totally fine. Note: it locked onto 13 satellites and functioned in GPS mode. The "eye" appeared indicating that the Vision Obstacle Avoidance System was engaged.