I don't know if this will be helpful or not, but I had problems with ADE 4.5 when trying to import or open ebooks made with Sigil 0.9.0 and 0.9.1 and the ePub3-itizer plugin. But the latest version of the plugin, 0.3.4, creates ebooks that ADE 4.5 will read.
Epubs made from every version of the plugin worked fine in all other reading programs I tried, including ADE 3.0. So I assumed ADE 4.5 was the problem.
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