I have recently installed Revolution X in my FSX to enhance my GENX Photo Scenery UK.  However, the scenery (trees and buildings) are being placed in areas where I don't want them, namely airfields that I have designed myself using ADE.  I have placed The airfields above all other scenery in my scenery library and my airfields have exclusion polys to exclude generic scenery.  Other airfields that I have downloaded (mainly UKMIL/ADG) are not affected so I am assuming I have not done something correctly when I have designed the airfields.  Any help on this matter would be greatly appreciated.

_{If they are library objects you will need to use exclusion rectangles rather than polygons.}