I have come across this problem myself and have come up with a solution which I have yet to post.  Unfortunately, I am away from my main computer at home so I can't give you precise pointers.  There was a mention here within this thread about someone obtaining a gray texture in the preview window.  The recommendation there was to connect the image-map to the Poser node.  I haven't tried that yet but let me see if I can pull something up for this evening.