texture problem: checked lines

[banger]

hello,

i was getting ready for the release,and i get a problem with the image conversions,n normal jpg version no prob's. but has soon has i convert any of the grass textures to DDS files ,i'm getting a checked lines all over the grasses.

:coffee2:

additional notes:
also notice that converting jpgs to dds on the buildings,gives them a strange distortion. from a white building to now completly black.?

 

[spamsac]

Could the building/DDS problem be because of an alpha channel issue?

 

[banger]

well the grass texture, i sorted now, i left has a standard jpg file,assumed it to do with the blending options.

the buildings,well i try to converted the jpgs, to dds and now rfactor won't load the track., ok there seems to be a problem with my machine converting to dds files.has i removed the sketchup models and rfactor restarted,?