Hi,
****
\documentclass{article}
\usepackage{xunicode}
\usepackage[quiet]{mathspec}
\usepackage{xltxtra}
\setallmainfonts[Mapping=tex-text]{Linux Libertine O}
\usepackage[ngerman]{babel}
\begin{document}
2ab \(2ab\beta\)
\end{document}
****
Running this throug xelatex makes it hang. Commenting out
\setallmainfonts[Mapping=tex-text]{Linux Libertine O}
or
\usepackage[ngerman]{babel}
makes it work with the desired result.
ciao
Toscho
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