While adding flatten & exclude polygons to a new FSX airport project, a T-shaped poly was created in Google Earth to exclude the autogen on the airport. A large general poly was then added which flattened everything properly. The earlier T-poly was then deleted as the airport objects appear to take out the autogen atop them. Now, when flying over the area, if all files (including the flatten created using KML) are in place, a portion of the T-poly remains visible as green ground north of the airport, in the same distinctive shape. When removing all traces of the addon scenery, including the flatten, the T-shaped piece is still evident but this time as a deep hole (pic attached). I ran a repair on FSX to see if any of the default files may have become altered, and the problem remains. Does anyone know of a way to restore the land in the area to default, or is there somewhere that I ought to be looking for the cause of the problem. Many thanks.
