Quote:
Originally Posted by MrPjax
If the font is done properly, it should show in ALL ereaders, correct?
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Yes, but some ePub reading apps ignore styles and/or don't support embedded fonts. Also some incorrectly designed fonts may cause rendering errors.
BTW, since the error message that you got seems to have come from FlightCrew you also may want to check your ePub with
EpubCheck Online. It also couldn't hurt to test it with
ADE.
If neither FlightCrew nor EpubCheck report any errors and the book looks OK in ADE, it's definitely the apps fault. I.e. there's nothing you can do, except maybe defining
sans-serif as the fallback font for your heading styles.