Also with P6 you could do a set of area renders instead of trying to render the whole
scene at once.  Then you could use a Photoshop or an equivalent to join the
sections together.  This might also show you which part of the render Poser
is having trouble with. Plus doing area renders means you haven't lost a
whole render if Poser crashes, just the section that made it crash.  Then
when you figure out what made it crash, you can add the fixed section to
the rest of the scene in Photoshop.