@esterau, thanks... I read with interest about your troubles recently. The camera in wall thing is intriguing... but in my case, no. No front wall for it to be stuck in.  But it's something to check for, indeed. Thanks for the reminder.

I managed to find a couple of scenes that were giving me trouble which I had not deleted. Both included AO on every prop surface. Removing the AO solved the problem. It also made the render look like crap.

Tweak the lights, try with IDL. Render still looks like crap, but took five times as long to do it.

Bah. Reducing texture size and/or slicing and splicing may be my only options as long as I'm operating under a 4GB per process limit. I'm assuming that a 64 bit poser would solve the problem too.

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PoserPro 2014, PS CS5.5 Ext, Nikon D300. Win 8, i7-4770 @ 3.4 GHz, AMD Radeon 8570, 12 GB RAM.