Flashing Brown Squares on Terrain

Hi Folks!This topic may have been bantered around before, but I forgot how to correct the problem. Here's the situation:As I pan around using the Virtual Cockpit, I noticed that brown squares quickly flash on the terrain textures and disappear. As long as you hold a particular view, flashing tends not to occur. However,if I start panning again, the brown squares momentarily show up and disappear.Is there some setting within FS2K2 or some setting within Riva Tuner, GTW,or NVMax that would eliminate the flashing? Any feedback would be greatly appreciated:KeithSystem: AMD XP 1700+ Duron Processor, GF TI-4600, 512 MB Ram, Windows 2000, Soyo Dragon motherboardNVidia settings: LOD: -3, AF: 2X, VSync: Off, Anti-aliasing: Off