Originally Posted by The Terminator
There is a Document Default font, isn't that the same?
That would require the epub to have the font embedded in the file. There are files that don't do this that are in Japanese for example. Try downloading "Kiss on the Phone" from Kobo.com. It's a free ebook.. If you can see the Japanese you probably have a Unicode font with the asian character set installed. If you see a lot of blanks, you don't and changing the setting for Document Default font makes no difference.