Poser 10 user here. This is only a suggesstion, but if I were you, I would drop the material AO completely. I have some props by another vender that were made more or less for Poser 7 and they have material AO on them. They take forEVER to render in P10. I got so annoyed that I went into the materials and deleted the AO from the material.

"A lonely climber walks a tightrope to where dreams are born and never die!" - Billy Thorpe, song: Edge of Madness, album: East of Eden's Gate

Weapons of choice:

Poser Pro 2012, SR2, Paintshop Pro 8