Quote:
Originally Posted by davotibarna
Again: the same content get displayed correctly in the history view, but when displaying the content I get question marks instead of the special characters.

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History view uses system font, which you updated.
EPUB books use EPUB fonts, which you didn't update (and it is not known how to update them).
Result: History view displays correctly, EPUB view does not.
Solution: Use LRF instead of EPUB. LRF uses system fonts.