Buddha13, I used the Natural Point grass textures and loved the close up look of the grass. One thing I forgot, this changes the look of the ground when flying above 500 feet. As you progress the ground had a different color and this distortion advance as you travel and receeds behind you. I posted the problem here and thankfully Panther remembered the high resolution grass textures cause the problem. Anyway I removed them and all looks great again.
Hope this helps, Tom