First of all, thank you for replying to my original posts, and also thank you for your excellent advice in another forum to upgrade my Aura HDs to Firmware 3.12.1. That has worked very well, and I'm very grateful.
On the question of the epubs that don't work properly, the first epub that I tried, the one that doesn't follow hyperlinks, is a copyrighted work which I can't legally distribute. It started life as an old-fashioned mobi file (as opposed to azw3), which got converted to epub. The epub has over 500 xhtml files in it, mainly scholarly notes on the main text, so plenty of use of anchor points. The xhtml (which I didn't write) seems needlessly complex to me. I wonder if the sheer size and complexity may produce some timing problem where the (putative) kepub renderer simply gets timed out by iOS before managing to complete a request that should generate the new location in the book.
Regarding the two simpler epubs that I tried (after some more thought), they are the versions which I contributed to the MR library of 'Persuasion' by Jane Austen, and 'The Golden Bowl' by Henry James. In those publications, the hyperlinks seem to work ok, but the title page and chapter headings don't get centered properly. (And these do work OK in two generations of Sony Reader, as epubs on my Aura HDs, two generations of Kindle after being 'kindlegened' to azw3, iBooks, and also Marvin. They also pass error free in epubcheck. I haven't tried them as kepubs on my Auras.)
However, on further consideration, I feel a bit embarrassed about maybe having raised this problem before I'd really thought it through myself. Personally my overall conclusion is that (sadly) the Kobo iOS app isn't (yet?) a better substitute for iBooks, so I don't intend to take it any further, and wouldn't want you to waste your time looking into this in more detail to help me. Thanks again for your thoughts
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