just to agree that one should use an alpha channel for the lashes in c6pro.
this differs from poser and even older versions of carrara, where it was possible to
use the transparency channel (in combination with diffuse and specular) to get a glowing
surface, due to the way the combination of the three could add up to more than 100%.

one other item in regard to c6pro's handling of lash transparency:
it's apparent even in the small image above that the shadows are wrong and/or bad,
which is a big part of the problem (beyond proper render and shader settings).
I've found it's very difficult to get a realistic shadow appearance in c6pro when zooming in
on the lashes.  the lashes may look solid in a typical render, but it's actually the bad shadows
that are making 'em look solid.