Sky graphical problem - Help please.

[zfkwiatek]

For about one month I can’t deal with strange graphical problem in game (currently 4.11.1 but early happens in 4.10). As I manage to figure it out it has something to do with latest nvidia drivers. My graphical card is nVidia Quadro Fx 1800 and after installing driver version 306.79 (and latest) it always ruins my sky when hardware shader = 1 (Perfect Mode). For somehow when I play in excellent graphical settings it disappear after 5 second. There is no problem when I have install my older drivers ( 296.88 ). Maybe someone have similar problem or know what could be the reason of that strange bright transparent strips over the sky. It is very annoying and when I’m looking allover its changing positions. It doesn’t appear over the aprox. 5000 meters high. I always try to keep my system up to date so don’t know what can cause this problem (Win 7 Prof. x64). Hope that image will show what I mean and maybe my conf.ini sets have something to deal with it. Would by thankful if someone could help me.
Regards

link: http://imageshack.us/photo/my-images/62/sky1z.jpg/

HardwareShaders=0

Shadows=2
Specular=2
SpecularLight=2
DiffuseLight=2
DynamicalLights=1
MeshDetail=2
VisibilityDistance=3

Sky=2
Forest=2
LandShading=3
LandDetails=2

LandGeom=2
TexLarge=1
TexLandQual=3
TexLandLarge=1

VideoSetupId=4
ForceShaders1x=0
PolygonOffsetFactor=-0.15
PolygonOffsetUnits=-3.0

[Render_OpenGL]
TexQual=3
TexMipFilter=2
TexCompress=0
TexFlags.UseDither=1
TexFlags.UseAlpha=0
TexFlags.UseIndex=0
TexFlags.PolygonStipple=1
TexFlags.UseClampedSprites=0
TexFlags.DrawLandByTriangles=1
TexFlags.UseVertexArrays=1
TexFlags.DisableAPIExtensions=0
TexFlags.ARBMultitextureExt=1
TexFlags.TexEnvCombineExt=1
TexFlags.SecondaryColorExt=1
TexFlags.VertexArrayExt=1
TexFlags.ClipHintExt=0
TexFlags.UsePaletteExt=0
TexFlags.TexAnisotropicExt=1
TexFlags.TexCompressARBExt=0

TexFlags.TexEnvCombine4NV=0
TexFlags.TexEnvCombineDot3=0
TexFlags.DepthClampNV=0
TexFlags.SeparateSpecular=0
TexFlags.TextureShaderNV=0

HardwareShaders=1

Shadows=2
Specular=2
SpecularLight=2
DiffuseLight=2
DynamicalLights=1
MeshDetail=2
VisibilityDistance=3

Sky=2
Forest=2
LandShading=3
LandDetails=2

LandGeom=2
TexLarge=1
TexLandQual=3
TexLandLarge=1

VideoSetupId=3
Water=2
Effects=2
ForceShaders1x=0

PolygonOffsetFactor=-0.15
PolygonOffsetUnits=-3.0