[OS X TeX] XeTeX - Beamer package font kerning problem

[Horst Hohberger]

After recently discovering XeTeX after trying and failing to get the
Chinese language pack CJK to work (ugh!), I have started to use it for
all my TeX files. However,  I have encountered some difficulties with
getting it to work with the beamer package (mostly resulting from the
fact that xetex is not compatible with pgf). The webpage at

http://www.cnblogs.com/agateriver/archive/2007/04/01/696153.html

proved to be invaluable, giving many hints on the correct settings
(without the dvipdfm option, xetex seems to crash). I have also
obtained open-type versions of the computer modern fonts CMU Serif,
etc. There is one remaining sticking point: the character spacing does
not seem to work properly, with parentheses running into letters in
mathematical formulae. The problem disappears if I specify a font
different from CMU which only has an upright version. Thus I surmise
that the problem occurs because no allowance is made for the slanting
of italics. Did I miss a setting in calling the xetex packages? For
reference, i have attached two example files (source+pdf) to this
post; if anyone could help me, I would be most grateful! I have spent
a few days searching archives and googling, but to no avail.

Horst
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