Any ideas what is causing this? Appears with both the default AFCAD and a custom one I made with ADE, so maybe its some landclass or mesh problem?

upload pics

upload pics
Hmm. Still there. Michael, in ADE at the top there are two buttons - a green odd shaped "add polygon" and a yellow square "add exclusion rectangle." Do I use the yellow square first, to add the airport background exclude and then the green poly to add the airport background (this is what I did do)?
host image online