OK, then I suspect that Khaled and Ross have already identified the root cause of the problem (see below); what happens if you (a) comment out the reference to Asana Math,
The result when \usepackage{Asana Math} is commented out is shown in non-asana-crop.pdf which is attached. The vinculum is present, but π is missing.
When I replaced
\usepackage{Asana Math}
with another otf maths font via
\usepackage{XITS Math}
the result was the same as with Asana Math. So, it is not otf
maths-font-specific.
and (b) (a separate test) replace it by a reference to a maths font that you have in a format other than OpenType ?
In this case, I need to load the euler maths font before fontspec to avoid a warning. With this file:
\documentclass[a4paper,12pt]{article}
\usepackage{euler}
\usepackage{fontspec}
\usepackage{unicode-math}
\begin{document}
\thispagestyle{empty}
$\frac{2\pi r}{r} = 2\pi$
\end{document}
I get the output shown in euler-frac-crop.pdf which is also attached.
Again, the vinculum is present, but π is missing.
If I comment out \usepackage{unicode-math} above, I get the correct output as shown in euler-correct-crop.pdf.
My guess is that, as suggested by James Cloos, the problem resides in the unicode-math package for 64-bit machines when compiled with xelatex.
Chandra
non-asana-frac-crop.pdf
Description: Adobe PDF document
euler-frac-crop.pdf
Description: Adobe PDF document
euler-correct-crop.pdf
Description: Adobe PDF document
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