Single colored textures without the blurred effect

[DRedshot]

I don't think it is a bug. I think it is just an illusion. The lack of variation of colour makes the specular lighting look blurry. if you make the material more textured, the blur should go away.

I can't see exactly what you are referring to when you say 'blurry' but if you mean the reflection is too blurry, try lowering the 'r' value of the specular map, or raising the 'g' value. this should increase sharpness.

edit: if you used lambert as the Material in blender, try changing it. Lambert isn't as suitable for metals as blinn. lambert has a softer specular diffuse, which looks really nice on woods, but a bit poor on metals.