Unfortunately, Poser 4 has always been flakey about multi-model scenes, or characters with hi-res textures. It doesn't seem very well written from a technical perspective, and like the PC's memnory architecture itself, Curious has gone too far down their current route to do an about turn now. The mere fact that the program doesn't support OpenGL/DirectX despite the fact that the rest of the 3D industry depends upon them for acceptable 3D performance, tells me all I need to know about Curious' software development team (well, Metacreations team but, you get the point!). Since Poser 4 came out, I've used it with probably 8 different motherboards, 20 graphics cards, four types of memory, numerous software configurations, but always Win 98. It locks up with every single configuration, so we can definitely rule out the motherboard, graphics card, driver possibilities, unless it fails to work with EVERY card and mobo on the market... I love the program dearly, but I get sick and tired of pressing the CNTRL -R keys never knowing if this will be the render that requires a restart. The problem, if there is any doubt whatsoever, is that the program does not return RAM back to the OS after each render, or after models are deleted. After a few renders, your memory has been completely munched and the only choice is a reload. The mere fact that you can reload and continue without restarting windows, seems to me to demonstrate very clearly, that it's Poser's interaction with Windows memory, rather than Windows' memory handling, that is the fault. If you require further proof of the program's instability, (as though any were needed!), loaded a couple of other program and leave them loaded in the background, then see how much quicker Poser locks up!!! Pro Pack was great, but I'd have settled for stability, 3D card optimisation and a real-world co-ordinate system in place of all the other stuff!