[XeTeX] Smart quotes, xelatex texlive 2011

[Anakreon]

Hello list.

I use ubuntulinux precise. Special characters such as smart quotes or "--" are not typeset as expected. I downloaded and installed the texlive 2011 distribution in the hope that it would solve the problem. However, the problem remains. From suggestions I found on the Internet, a minimal example demonstrating the problem is the following:

\documentclass[twoside,a4paper, 12pt]{article}
\usepackage{fontspec}
\setmainfont[Mapping=tex-text]{Times New Roman}
\newfontfamily\greekfont[Script=Greek]{Times New Roman}
\defaultfontfeatures{Ligatures=TeX}
\usepackage{polyglossia}
\setdefaultlanguage{greek}
\setotherlanguage{english}
\begin{document}
Outside ``english'' environment --

\begin{english}
``Quotes'' -- inside english environment  
\end{english}

\begin{greek}
  ``Ελληνικό'' -- περιβάλλον
\end{greek}

``Ελληνικά''
\end{document}



I have attached the resulting pdf file and the original tex example. Experiments with other fonts (DejaVu Sans) made no difference.
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