Same problem for me on 2.75.1 using the latest Mac OS 10.12.2. When using the Calibre book viewer, about half my ePubs show nothing but a huge blue question mark on every page. Also, all the books I tried to view have a problem with the TOC. When a chapter link in the left column is tapped, Safari opens with an error message, instead of Calibre going to the correct chapter in the viewer. I had to revert back to 2.75.0.
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