I know exactly what he is reffering to and asked the same question of Daz Tech support, and never got a response. It's still sitting in my questions folder at Daz waiting for a reply.

When you load V4.2, and use the MAT files for her textures (I have the high rez ones), all textxures load properly, they show up fine in the materials room. But prior to rendering, what you see for her eyes are her right eye is fine, looks normal, but the left eye only appears as white. When rendered, it comes out fine.

I think its more of a Poser problem than a V4 problem, as I can duplicate it everytime in Poser, but not in D|S