> You are probably using a font that doesn't have those characters. Try
> using the DejaVu font, which has better coverage.
This is correct. I changed the font used by the stylesheet to "DejaVu
Sans" and it started working.
Disclaimer: I'm responding to this old thread because some people
still have this problem, I got a direct mail. In hindsight it was a
little impolite of me to not confirm that your fix worked.