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- what OS (Windows Xp/Vista, Mac etc.) are you running? - what FlightGear version do you use? - copy&paste your commandline.
Does anyone know why the (Callsign Multiplayer Aircraft selector) which is displayed in the bottom left of screen is not visible? I see it fine but some of the pilots i fly with don't see it.
In 2018.3.2 you will find it only in Model view. In later versions it is available on all views (except flyby as far as I remember) and Model view has been removed.