Wow---setting to zero? But on the other hand, why then does Carrara default to "none" if "none" is not a non-zero entry? This apparently means you need to manually set a value of zero for every channel you aren't using in a texture. I'd call that a bug. But I also have hopes that this will finally solve the "black eye" problem in Poser imports (in every version of Carrara I have tried -- prior to 5pro, which I haven't fired up yet -- eyelashes will not render fully transparent.)