After a reinstall, the problem presists.

It seems to be how Firefly translates the camera settings, since I was able to get a few more items to render after changing the focal length. Why it doesn't happen with every scene is still a mystery.

Historically, Poser isn't  stable until SR3. So hopefully something will stabilize when SM releases their SR3. But Tech Support doesn't seem to want to really look at the problem, at least my problem. So if you've had this happen, let them know.

-- Jeff