The Poser OpenGL preview always looks weird for me. My guess is that the developers didn't spend much time on finding good depth buffer settings. So for me, the preview's absolutely useless when determining pokethrough. Typically, it's that I see bad pokethrough in the preview when everything's fine in the render. But I wouldn't swear that it's never the other way round.

-- I'm not mad at you, just Westphalian.