If it's what I think it is, either ;
       a: turn off texture filtering in render settings, or in Poser 7 and Poser Pro on the texture nodes in the material room (there is a script in freestuff that will do this for you all at once here http://www.renderosity.com/mod/freestuff/index.php?user_id=99327 )
       or b: decrease the Min Shading  Rate in your render settings.