Help with displace
 

Im having a NIGHTMARE!
I have export the color map, normal map, cavity map, and displacement map from zbrush to maya, but when I use the mental ray surface aprox to get going the displace, the maps go to hell.
plz check and help me if you can.
Im using spatial for the aprox method in the subdivision surface quality tab, as in all the tutorials they say you have to use this method, for me its not working.