Mike,
Thanks for your answer. But before implementing your suggested fix, I decided to take a closer look at the files in question to rule out any obvious miscues. What I discovered is that the writers (both relatively new to FrameMaker) were running the image frames outside of the frame for the page, thus causing the images to cutoff. The images printed properly when we fixed that issue. So, luckily it wasn't any more complicated than that.
But thanks again for your informative response.
Rick