Quote:
Originally Posted by writingboy
The majority of the pings come from one specific section of HTML, which contains several hundred ↺ characters meant to link readers back to the sections from which my endnotes originate. I've tried tweaking that, but no such luck.
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One possibility that comes to mind is that epub3 does not support HTML named entities. You might want to try replacing ↺ with ↺ (double check that as it's not a character I make use of). Repeat for any other HTML enties such the the right and left quotes. I've been bitten by this a few times since my favourite entity is not supported and & #160; (remove the space) just lacks the same human readability.
For epub3, I would suggest using Sigil instead of calibre's editor. At this time, it simply supports epub3 better than calibre's editor does.