Problem with Grid Texture
 

Hi,

When using the procedural grid texture, I find that it doesn't display correctly in High Quality mode, and the grid becomes dots. The same thing happens in regular hardware texturing mode if I switch the texture resolution to anything but 'default' under the 'Hardware Texturing' attribute of the shader.
Has anyone else had this (... or similar problems with other textures)?
I'd be surprised if it's a video card problem as everything else behaves as expected.