[XeTeX] bug using \underbrace with unicode-math package

[Apostolos Syropoulos]

>>  Today I finally updated my TeXlive installation to
>>     * unicode-math version 0.6      (2011sep18)
>>     * fontspec     version 2.2a     (2011sep18)
>>     * l3kernel     version SVN 2828 (2011sep15)
>>

I have v0.6a of unicode-math and all others are the same but the following code

\documentclass[a4paper]{article}
\pagestyle{empty}
\usepackage{unicode-math}
\begin{document}
\setmathfont{Asana Math}
\begin{displaymath}
\overbrace{a,\ldots,z}
\end{displaymath}
\end{document}

does not compile and gives

! Missing number, treated as zero.
<to be read again> 
                   [
l.7 \overbrace{a,\ldots,z}
                          
? 

Also, \underbrace gives the same error message:

! Missing number, treated as zero.
<to be read again> 
                   [
l.8 \underbrace{α,\ldots,ω}
                             _{d} 
? 

So I wonder how it works in your system?

A.S.


----------------------
Apostolos Syropoulos
Xanthi, Greece