Poser 6 has a bug in it in regards to mirroring transparent objects.
I e-mailed E-Frontier about it. They had me send them the PZ3
file so they could look at it.  They acknowledged there
is a problem but had no solution.  In my case it was the
eyebrows that looked funky. But in that Koz's hair depends
on transparency maps too, this is going to happen there too
and apparently there is nothing that can be done about it.
I'm not sure if SR3 fixed it or not, but I didn't see that
problem listed in the items SR3 is supposed to fix.