A VERY WEIRD texture problem

Have a look at the picture below (sorry about the poor quality) The Aircraft is in Lyon, France, as you can see in the map view the ground textures are represented by large squares. The green squares have the "airport grass" texture on them and the grey/black squares, nothing. Sometimes I see night textures appearing in daytime.I did not suffer from blurry textures and this problem only happens in Europe. I'm 100% sure that all files in scenedb/world/ are original because I copied them from the CD.My Hardware Specs: P4 1.5Ghz+256mb RDRAM+Chaintech Gf4 Ti4200Can anyone help?