Hi Richard, There is a known bug in older versions of XeTeX which can cause problems with math symbols in some fonts. The bug report for Ubuntu can be found here:
https://bugs.launchpad.net/ubuntu/+source/texlive-bin/+bug/364627 I was able to fix the problem by editing a configuration file: /etc/texmf/dvipdfm/dvipdfmx.cfg Comment out: "f pdftex.map" Uncomment: "f dvipdfm.map" I haven't had any trouble with newer versions (either that shipped in TeX Live 2009, or 2010). Cheers, Rob
