I am making a new Poser model of a big mechanical device (a grab-dredger-submarine, hull length about 100 feet and the grab-arm can reach about 150 feet when unfolded). When I ctrl-R render a scene including it, the "progess of rendering" box gets through the first stages as usual, then displays "rendering shadow map for light 2", then the thin white box goes all black from left to right as usual - then the render jams, and clicking the "stop" button doesn't work, and I must ctrl-alt-del to stop Poser. (I have Poser 4.0.2). What might cause this? Is this a known bug with rendering big models?

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