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In my case, I haven't added any of my own fonts. I edit every book and remove all references to specific fonts. I run strictly with the fonts that are (supposed to be) on the device.
It's odd that in the year and a half that I had a Forma, I never saw this. But, I can't think of any way the built in fonts disappearing could be associated with specific hardware. Of course, I believe that Kobo did make some kind of changes to built-in fonts with recent firmwares. Maybe this is a bug associated with those changes.
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