[XeTeX] Mathspec Texshop Degree-symbol

[lordofcambridge at gmx.de]

Hello everyone.

I just discovered XeTeX and I am amazed by the new possibilities opening up by using professional system fonts.

I just have one problem: 
When just using the fontec-package everything works fine. If I load the mathspec package to adjust the appearance of the equation and results, the "°" degree signals vanishes from the math environment. 

I am using Mac Os X 10.6 and all the latest versions of Texshop and TeXlive2010. 

Here two small examples:

\documentclass[12pt]{article}
\usepackage{fontspec}
\setmainfont{Linux Libertine O}

\begin{document}
This is a small test document to check if it works

°	360°C	$360°$

\end{document}


When using the mathspec-package to adjust the math font, the degree symbol disappears from the output. 


\documentclass[12pt]{article}
\usepackage{mathspec}
\setmainfont{Linux Libertine O}
\setmathfont(Digits,Greek,Symbols,Latin){Linux Libertine O}
\begin{document}
This is a small test document to check if it works

°	360°C	$360°$ 

\end{document}


When I try to use $360^{\circle}$  I get an error \circle is invalid in mathmode. 

It all worked very convient inLaTeX, so is there a way to tell XeTeX to set the degree-symbol?

Thank you al very much and a nice day,

Simon
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