It is my experience too that if you find one, you will find more. In my last case of this there were mysterious spaces that would not allow numbers to line up. It took me a couple of hours just to find and delete this relatively small problem....and it was not really substantial either.
But if it is the wrong code page it is back to calibre, isn't it, because Sigil doesn't have to deal with wrong code pages..theoretically at least.
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