Hiya guys, I'm pretty sure this has been covered before, but what in the name of God is going on here! The problem doesn't occur with GI turned off, so WTF? For the record I haven't messed with any shaders; everything here is right out of Poser 6.

Here is a previous conversation on this subject:
http://www.renderosity.com/mod/forumpro/showthread.php?thread_id=2671534

I spent an hour sifting through the archives and I totally missed that thread. Thanks jubjub!
Crank up the interpolation, that fixes it :)

Another thing to note is you really got to crank up those settings to get GI to go through transmapped eyelashes. It might actually be easier to do several passes, or set the eyelashes to partly transparent.