It is often the case that Ctrl-F12 shows only "Runway 8 Start" and "Parking" with parking positions 1 to 4. Obviously, the program is not recognizing my airport. This happened to me at EDDN or EDDM after landing. However, when I start at a gate in these airport, the program is working perfectly. Moreover, it works most of the time after landing, but not always. The airports are freeware addons. But I wonder why it works sometimes and not always.
Is there a way to force the program to recognize the airport I'm on?