Here is screen shot. Did you set scenery complexity to normal in FSX?Here is my KML file. I tried added another row of houses with a different tag so now one is of bricks the other of some other material. One is just NE of the airport but you will only see a brown deserted place without houses. The other is just northwest of the small lake that is near the airport runway. Again, only a brown road is shown.
As you see on my KML the houses are the last thing in the list so they should have been rendered after everything else yet none shows.
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