OK, it looks like it was the graphics card. I talked to tech support at AMD, and it turns out that the card I got was great for gaming but not for rendering. I had assumed that if it was good enough for gaming, it would be good enough for rendering.

I traded it in for a card that at least knows OpenGL, but only has 128 MB of memory. Not good enough.

Can somebody recommend a good basic graphics card for Poser work so I can stop wasting my time on these hardware problems and get back to wasting my time 3d art?

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OS: Windows 10 64-bit, Poser: 10