I have been ahving this problem off and on for a few weeks , since I got this new Dell 8400 with a 3.4 Gig and Nvidia 6800 GT with 256 Ram. All of a sudden the scenery will look like it went to CGA resolution. This happens mostly when I go to FSNav which I run full screen and then back to full screen FS9. Sometimes I can "shock" it back into normal grahics, and if I switch to windowed mode, may times , it will clear up. Go back to full screen, and it is NG again. I have experimented with most Graphics card settings and nothing seems to make a difference. If I reload the aircraft I am in ( doesn't matter which one) , many times this situation seems to go away, for the rest of the flight. I tried the latest drivers for the GT6800 a few weeks ago, but I wound up with stuttering , so I switched back to the orginals. One shot is normal and one, when this weirdness occurs. As you can see, it affects the ground textures as well as the rest of the scenery. http://forums.avsim.net/user_files/112526.jpghttp://forums.avsim.net/user_files/112525.jpg

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i know this is not a complete cure but it works for me, sometimes when viewing AI (ctrl+W) the scenery takes a little while to get into detail and i suffer the lower level mips as shown in your picture, i find that by asigning a key (i use tab), i can quckly refrsh the scenery bringing everthing back to full sharpness.