Same problem for me with ADE airports. All the airports I compiled using the P3D v4 SDK will not show on the DU but revert to the default airport. Looking forward to a solution as I have converted all my ADE airports. FSDT, Fly Tampa, Flightbeam, Aerosoft etc. airports work fine but as far as I can gather they are not using the P3D v4 SDK consistently.
Have a great day
Greetings
Charles