ImageFormatter cannot find fonts in OS X 10.8 Mountain Lion
fc-list command used to find available fonts on *NIX systems does not work on OS X 10.8, as it does not include X11 anymore.
See this stackoverflow.com question for alternatives.
In addition, I doubt the *NIX default font
Bitstream Vera Sans Mono ever shipped on OS X (it is a least not available on 10.8).