Terrain texture doesn't render properly, blue on minimap

Hello,

A friend and I have recently observer the following behavior: after a certain time in-game, the terrain texture in a few sims does not render correctly, it stays all gray (instead of being, for example, green) and in the minimap view, the terrain is rendered as water, while the buildings are displayed correctly. This has happened to my friend and i in Kaili multiple times, and i saw it in Garrison too. The problem can be fixed by login out and back in; waiting half an hour or more for the textures to load doesn't help. I don't have a screenshot handy, but i can take one next time it happens. So - is this problem known? Is there a fix?

(Video card: GeforceFX 5200; Preferences: AGP checked, terrain texture "some".)

Yea i've had the problem too, it looks like the top level of terrain isnt being loaded from the sim, not sure if its fixable in 1.6 i just relog, but i havnt seen it happen in the preview 1.7 so might have to wait for that