[Bug] Changing font doesn't work if an ePub book as an embedded font.
Ran into this one the other day. One of the eBooks had an embedded font that looked hard to read on my phone. When I tried to change the font it didn't do anything (seems like embedded font takes precedence).
Found that Lithium reader has an option for "use embedded" as one of the choices vs custom which allows switching between default and custom font.