[XeTeX] Strange quotes symbol

[Suki Venkat]

Hi,

Whenever I use

\textit{\mu}

instead of the usual UTF-8:

 \textit{μ}

I get a strange quote symbol before the Greek mu in the PDF.
In the preamble I use:
\usepackage{mathspec}
\setmathsfont(Digits,Latin,Greek){Linux Libertine}
\setmainfont[Ligatures=TeX]{Linux Libertine}

You can recreate the problem with any other Greek symbol or any other font
other than "Linux Libertine".
If we comment these lines in the preamble then I get the usual error
message saying missing dollar etc. but with the above preamble I get no
such error message but a PDF with a extra quote sign.

Suki
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