Grey squares in my Ortho4XP scenery.....why?

[Scottl59]

Anyone know why I am getting grey squares where buildings are located in my Orhto4XP scenery just under my aircraft as I pass over? Farther in the distance all the buildings in the  scenery are fine until I fly over them and the buildings change to grey squares.

[Scottl59]

Found it. I had to lower the number of world objects to 0.

[soaring_penguin]

Did you file a bug report? 

[Scottl59]

No. I am new to XP and was not aware I should do this. I found by the world objects to 0 fixed it but I now have no buildings.