Quote:
Originally Posted by Semwize
I perceive this as an optimization of custom added fonts for Kobo. As in the case of Bookerly, for example, which also needs to be edited, but no one wrote about it to Kobo 
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I know Kobo optimized the fonts included with the device. But, that isn't the problem here. The problem is the results are inconsistent. It looks like it depends on when the font is loaded. That speaks of a bug. And as I said, suggests something is not be initialised properly. But, it could be triggered by something in the fonts. Maybe an inconsistent value in the font, or one outside some expected range, is ignored and a default or last value is used. Something like that would explain why changing the font fixes it.