Dreamwriter:
What other settings, might you have, in your CSS, that could be affecting this? For example, what fonts have you embedded? What characteristics (metrics) do the fonts themselves have, if any? Any kerning, leading, etc.?
I've seen a lot of hinky caused through upstream settings, unrelated to direct hyphenation settings. This isn't to say it's something you're doing--likely it is some whacko update created by Amazon--but it's worth asking.
Hitch
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