Problem with clouds and terrain textures at dusk and at...

Hi,When I fly at dusk and at night, I've got some displaying problem with certain textures. For instance, the clouds are funny and look like Disney ones (ugly grey colour) ; they don't look real at all. I've got the impression that I'm flying with FS98 ! In addiction to that, I've got some white patches on the ground with night textures. When I fly close to them, the white patches disappear and the terrain look more real. Strange ...:-rollHere is a screenshot of my problem :http://peggy.sellier.free.fr/Captures/FS2004/Picardie.jpgPlease could you tell me what is my problem due to ?Thank you.Regards,;-)Damien BRUNET - LFQQ.e-mail : [email protected]http://damien.brunet1.free.fr/Logos/Signature_UDB.jpg