There has always been a problem with the "Default" M4 Rendering in PoserPro, To date Daz hasn't corrected it.

This should give a quick example that Poser 8 does handle things differently.
M4 PoserPro render on left

M4 Poser8 render on right

Notice the difference?

"That government is best which governs the least, because its people discipline themselves."
Thomas Jefferson