I thought I had the answer: even though Threepress found no errors, Flightcrew found that I hadn't used some images that I had added to the epub. I removed those unneeded images, saved, and checked again with FC - no problems. Great Hopes at that point, but after sending file to bebook there are still the same no-show images, that are definitely in the unzipped manifest and in the Images subdir. I've exhausted my abilities to troubleshoot the problem.
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