Originally Posted by ShellShock
Ah come on, it is a bug in 2.4.0 that was not in 2.1.5. Just because it was also in a previous firmware (post 2.1.5) doesn't mean we should just ignore it, as Kobo seem to be doing.
I don't ignore it. I simply use a font (Charis SIL) which supports the characters I need (fact) and is very readable (personal opinion). If you check the Modified Font sticky, you'll find other fonts. As for the changes in the fonts, I don't know why Kobo changed the font files though I've read one message to the effect that it was a legal requirement to keep people from easily copying copyrighted fonts for use on other devices.
I've attached the file I use for font testing below. If italic, bold, bold-italic do not work and if all the characters do not show up correctly, I regard the font as being unusable and don't use it.