Okay, I tried lowering the bucket size to 16. It rendered without any error messages...but it doesn't look right. It did something weird to the textures. It's like there's another texture, or a reflection map, applied over them.

I restarted Poser and opened the file again, to see if just setting the render settings to Final was enough to do this to the textures, but no. I looked in the material room, and the textures were fine. (After I rendered, the textures looked like this even in the material room.)

A recent image in my gallery shows how it's supposed to look.

FWIW, I have Radeon 9700 Pro with 128 Mb RAM. Drivers are the latest (no Catalyst).