[XeTeX] Problems with fontspec and mathspec

[Tobias Schoel]

Hi,

the following minimal example:

\documentclass{article}

\usepackage{xunicode}
\usepackage[cm-default,quiet]{mathspec}
\usepackage{xltxtra}

\setmainfont[Mapping=tex-text]{Linux Libertine O}

\setmathfont(Latin){Linux Libertine O}


\begin{document}
Quiz \(2ab\) 2ab


\end{document}

This results in the following error messages:


! LaTeX Error: Encoding scheme `EU1' unknown.

See the LaTeX manual or LaTeX Companion for explanation.
Type  H <return>  for immediate help.
  ...

l.9 \setmathfont(Latin){Linux Libertine O}

Removing the option cm-default from mathspec (which passes it to 
fontspec) results in no error-messages and the desired effect.

Why is this?

Thanks

Toscho