My experiences have been that OpenGL causes more headaches than it's worth... Of course my video card and Mac are anything but state-of-the-art (Well, it used to be a fancy computer). Anyway, I use the same version of Poser as you do (8.0.3) and initially had hardware acceleration activated for preview and encountered similar bugs, particularly when I would load very complex shaders, so reverted back to SreeD display. I personally see OpenGL as more of a luxury than a necessity, always got along fine without out in Poser 6 and 7 on my last machine, but I imagine that Poser users with more sophisticated hardware and 64-bit have a different perspective.