Hi all, today I discovered an issue with some fonts that was not happening to me before.

Kindle PW 2019, updated.

I usually have Atkinson Hyperlegible font for most of my reads (non-fiction mainly), I tried to open a book I just loaded (AZW3 using Calibre), only to find out that the book seemed empty (aside from the cover). After testing various things, I found out that if I changed the font, suddenly the book "appears". If I switch back to Atkinson then the book "disappears" again. This happens with two fonts in fact: Atkinson and Isidore. What I have tried:

1. I tried other books, it happens on all I tried, even on books I have read with the Atkinson font before.
2. I loaded the MOBI version of the book, and the same was happening.
3. I deleted both fonts from the Kindle, downloaded them again from the Internet, tried both of them on my Mac with success and put them back again into the Kindle (after a restart), and the issue still persists.

Does anyone have any clue as to what might be happening?

I was using the font without any issue until today.