Make sure that the display option for textured is set (it's the last button, the one circled in yellow in the pic). The default is the one shown, and will often produce what you see. outside of that, it could be a caching issue within poser -- rectified by adjusting your virtual memory settings typically.

thou and I, my friend, can, in the most flunkey world, make, each of us, one non-flunkey, one hero, if we like: that will be two heroes to begin with. (Carlyle)