Blocky brown ground textures at low alt.

Hi all
Just installed FS2004. It runs smootly and with decent framerates on my mid end computer (AMD Athlon 1.5 ghz, Radeon 9600 256 MB (Cat. 4.4), 512 MB RAM).
But when I switch wiew at low altitude I get some blocky brown ground textures. It only last a split second or so, then everything looks ok, but it's very annoying. Is this a know problem?
I have tried every combination of graphic settings (in the game and on my videocard) that I can think of, tried using catalyst 4.2, re-installing the game, but no luck so far.
Strange thing is that all my other fligt-sims (Falcon 4, Il-2 FB AEP, FS2002, and even LOMAC (on low settings)runs ok.
Any suggestions? Thanks in advance
Klarck
edit: screenshot is taken with high graphic setting, it's not that bad with low settings, but I cant get rid of the brown scenery textures completly.

Just installed FS2004. It runs smootly and with decent framerates on my mid end computer (AMD Athlon 1.5 ghz, Radeon 9600 256 MB (Cat. 4.4), 512 MB RAM).
But when I switch wiew at low altitude I get some blocky brown ground textures. It only last a split second or so, then everything looks ok, but it's very annoying. Is this a know problem?
I have tried every combination of graphic settings (in the game and on my videocard) that I can think of, tried using catalyst 4.2, re-installing the game, but no luck so far.
Strange thing is that all my other fligt-sims (Falcon 4, Il-2 FB AEP, FS2002, and even LOMAC (on low settings)runs ok.
Any suggestions? Thanks in advance

Klarck
edit: screenshot is taken with high graphic setting, it's not that bad with low settings, but I cant get rid of the brown scenery textures completly.