[rcentros]

This looks like it might be a Calibre 5.3x issue. I've always embedded Constantia in my converted books. It always worked fine (even with Sony eReaders). Now it doesn't. What's weird is that, in Calibre's built-in eBook reader, Constantia shows as the default font. When I transfer the same book to an eReader (any eReader) I somehow lose Constantia? Never ran into this before. I even tried converting a Kindle book I converted a couple years ago. The original conversion works as expected. The new one does not.

This was my brain's fault. It's been so long since I've done any converting in Calibre that I forgot that you have to clear text properties (at least sometimes) when embedding a new font into the book. Also, the reason the Calibre eReader properly displayed the Constantia font is because I set up to use Constantia. (I forget about that also.) So I batted 0-2 on this.