I've installed KDFW and KPHX from FRF. When I go to the airports in FS I can see the underlying terrain mesh is showing through the airport scenery, and the autogen buildings and trees are also showing up over the airport. I have FS Genesis mesh installed, as well as Ultimate Terrain. I have installed the airport sceneries as per the instructions, i.e. within their own folder and activated within the FS Scenery options.I initially thought it was a problem with the scenery layers order, but I have them in the correct order - from lowest to highest - FS Genesis Mesh, UT, airport sceneries. It's almost as if there is an exclude or flatten file missing from the sceneries. However, checking the KDFW scenery I see there are exclude files included.Now the really weird bit, when I disabled the sceneries within FS, i.e. unchecking the scenery entries, I no longer have either KPHX or KDFW at all in the airport list - not even the default sceneries.Does anyone have any ideas what is going on?

The two sceneries you mentioned are based on the default airports and are not designed to work with terrain meshes. Try removing the mesh and see what happens.