We still need to verify that the same options for Modify Epub are being selected. It sounds like there are quite a few choices available. Also, you still didn't mention whether you tested both EPUB2 and EPUB3.
And since Calibre is involved, we have to make sure the epub is not being opened in Sigil via the third-party calibre OpenWith plugin. I long ago gave up debugging the on-again-off-again issues that arose when running Sigil via Kiwidude's OpenWith calibre plugin. Especially when calibre's own internal Open With feature has worked fine for years.
Last edited by DiapDealer; 09-14-2022 at 10:34 AM.
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