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Alex, I might be worth your time to have a browse through the Sigil forum on this site. I remember a few threads that addressed the problem you are having - they tended to be css problems in the publication.
While an epub will pass validation it does not mean that there are no small discrepancies in it that may be picked up by individual readers.
What you are seeing may be caused by the image size description or a spare tag after it that causes the reader to give a blank page.
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