I have just noticed that the sizes of main 2D panel bitmaps for different aircraft vary. Some are single or multiples of a "standard" monitor size - ie 1024x960 -- but others are weird sizes like 1024x531.Why is this?Thanks Barry

Because not all aircraft have a full-screen main panel bitmap.Especially most default aircraft, which have things like overhead panel as a seperate window, and NOT as part of the main window.Rob