Mmm, i just made a try with a bump map on the PC version 4.03 and let Y=1 for scale... and it worked! with value of Y=-1 it is all screwed up! Isn't this Y=-1 thing for all kind of maps or only texture ones?! Anyway in this case i just added the bump maps in a poser scene i imported (textures already on), in case this is a special case :)