As a workaround, if you go to the render settings, preview tab, and uncheck the "enable hardware shading" checkbox, it will show the Firefly/PoserSurface material instead of the Superfly/Cycles material. It's not as good as a real Cycles view but it can be helpful when you are trying to pose your figures so you aren't just looking at white silhouettes. Just make sure you have a PoserSurface root with your texture map attached.

An alternate workaround is to switch to Firefly until you are ready to render. But personally, when I do that, I always forget to switch back before rendering. Maybe you are smarter than me and won't have that problem. ;)