Mandoble,
here are some results of my trials I made following your suggestions:
I tried with ACE (ACE planes and others from different addons) and without it with one single plane, without putting anything in the mision folders or scripts in init field of the plane while in the editor.
The risult was that with the ACE the action in the menu was shown; as far as I picked the desired airport the green panel correctly had the white line of bearing to the airport but the circle, the square or the cross on the HUD was stuck in the middle of it without moving.
Any idea?
Ho BTW, I didn't find the demo mission.