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

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