For the record, I read epubs almost exclusively and have no issues with any settings, custom fonts included. But then, I edit the formatting of all my ebooks to match my preferences and patch my Kobo quite heavily. I've also had to rename some of my custom fonts with FontForge, else they didn't work properly (merely renaming the font file doesn't help). So yes, epubs on a Kobo can be finicky. Still, if you have issues with ALL your epubs and ALL your custom fonts, then someting's wrong with either your device or your fonts, or both.
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