Sorry, but looking back over the posts in this thread, something else occurred to me. You say different ebook formats are affected, but not which ones specifically.
Maybe this is an antivirus issue? I know that older PDFs can contain offensive scripting (ie, macro viruses, like MS Office used to experience years ago). While it is unlikely that multiple formats had a virus, it's still something to check. (Unless it was multiple formats of one ebook.)
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