Hi all,
I was also having problems with math symbols not showing up correctly in PDF
documents, and manually upgrading the fontspec package from the distributed
version 1.13 to the latest upstream version 1.18 made my math symbols
(e.g. summation sign) show up again.
Fontspec can be downloaded here:
http://www.ctan.org/tex-archive/help/Catalogue/entries/fontspec.html
Note that you might need to run "latex fontspec.ins" once to generate the
necessary files. You need fonspec.sty and fontspec.cfg in your texmf path.
Symlinking those files into the directory in which your .tex file resides,
works as well.
— Wouter
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