lilypond-book snips the letters "fi" from all my music

[Christopher Meredith]

I've got a bizarre problem. I'm using lilypond-book and for some
reason, it is cutting the letters "fi" wherever they appear (as long
as they are lowercase). So "fine" become "  ne" and "first" become "
rst". Blank spaces are left where the letters once were. Here's an
example .lytex file:

%!TEX TS-program = Lilypond-LaTeX
\documentclass{book}

\begin{document}

\section{Amazing Grace}
\lilypondfile[staffsize=17.82,line-width=18\cm]{/home/theophile/Desktop/Music/supplement/abstraction/Amazing_Grace.ly}

\end{document}


Compiling the source .ly works fine. AFter running lilypond-book, I go
into the build directory and the rendered pdfs all have the text
properly. It's only the final pdf that's messed up.

I'm using version 2.12.3. Any ideas?

Thanks!

Christopher