solvable but needs some detective work.
. what is the exact sequence of operations you use e.g. is it amazon into Kindle for PC, then into calibre then into ( which?) editor.... are any plug-ins involved, what conversions are you running, or tweaks....
you need to inspect the book at every step to determine when the images are going missing, if indeed we are dealing with missing images,; your " control document" is a copy downloaded direct from amazon to kindle so you can see what is in the original, when read on that same device.
then check the original in K for PC, before it reaches calibre.. check the version in calibre before you edit it.....
i suspect a conversion setting needs tweaking.
can you post a code view snippet for one of those rectangles, from the editor, so we can see if the code is referencing a missing file.
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