[XeTeX] Getting vinculum in fractions with Asana Math and unicode-math when compiled with xelatex

[Philip Taylor (Webmaster, Ret'd)]

Looks perfectly normal when processed using XeLaTeX
from TL 2010  under Win/XP;SP3' the resulting PDF is nothing
like the attachment to your more recent message,
with significant spacing 'twixt denominator and
numerator and with dividing rule clearly in place.

Philip Taylor