"I don't know if it's the right place for this topic ?!..."

Hi,

Sometimes it happen in my game to see the clouds shadows that appear like big squares :

Did you have ever seen that in your game ?

Do you have any idea what caused this ?

Here, my OpenGL config.ini :

[Render_OpenGL]

TexQual=3

TexMipFilter=3

TexCompress=0

TexFlags.UseDither=1

TexFlags.UseAlpha=0

TexFlags.UseIndex=0

TexFlags.PolygonStipple=1

TexFlags.UseClampedSprites=0

TexFlags.DrawLandByTriangles=0

TexFlags.UseVertexArrays=1

TexFlags.DisableAPIExtensions=0

TexFlags.ARBMultitextureExt=1

TexFlags.TexEnvCombineExt=1

TexFlags.SecondaryColorExt=1

TexFlags.VertexArrayExt=1

TexFlags.ClipHintExt=1

TexFlags.UsePaletteExt=0

TexFlags.TexAnisotropicExt=1

TexFlags.TexCompressARBExt=0

TexFlags.TexEnvCombine4NV=1

TexFlags.TexEnvCombineDot3=1

TexFlags.DepthClampNV=1

TexFlags.SeparateSpecular=0

TexFlags.TextureShaderNV=1

HardwareShaders=1

Shadows=2

Specular=2

SpecularLight=2

DiffuseLight=2

DynamicalLights=1

MeshDetail=2

VisibilityDistance=3

Sky=2

Forest=3

LandShading=3

LandDetails=2

TypeClouds=1

LandGeom=3

TexLarge=1

TexLandQual=3

TexLandLarge=1

VideoSetupId=17

Water=4

Effects=1

ForceShaders1x=0

PolygonOffsetFactor=-0.15

PolygonOffsetUnits=-3.0

Thank you very much in advance.