Bingo! Turns out there was an old HP610C printer driver still there I had forgotten about in addition to my current printer. I uninstalled both, checked poser: rendered fine. Then I re-installed the driver for my current printer. Checked again, and poser still works! It must not have liked the old driver, or at least not having both drivers installed at the same time. Thanks a lot, Jim! It would have taken me quite a while to start looking at printer driver problems!