Weard white flakes among cloud-textures

Hi!I`m experiencing a cloud-texture problem. It seems to occur when I use Active Sky`s texture files. High up in the sky some unrealistic white stripes mingles between normal cloud-graphic.Screenshothttp://server5.pictiger.com/img/383764/com...ite-stripes.phpI posted this issue on the Active Sky-forum, and was adviced to both reinstall the active-sky program and the drivers for my 3d-card. After I had done this, the problem seemed to be solved. Unfortunately for a while. Because lately, it has occured again. I`ve reinstalled the originally FS9 texture-files, without any success.What could be the problem here? Is it maybe possible that my 3d-card doesn`t cope with the simulators cloud-graphic?Regards,Jan Ove Larssen