Tom, as I understand, part of the reason that BookView is buggy, is because of some quirks of Qt which are not going to be solve by maintainers of Qt. Even stronger, the components used for BookView are no longer available in the newer versions of Qt. As Sigil is cross-OS, there are not that many options for GUI programming, Qt is one of the view.
All in all, this causes a lot of issues. There are other options outside of Sigil. If I am allowed to tout my own horn, I have created a Word add-in (freely available) with a large number of tools that can help in ePUB creation. You can even export a Word document directly from Word, retaining the most important styling.
Just saying, use the best tools for the job. For writing, use a word processor. For ePUB creation/editing, use an ePUB editor.
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