[XeTeX] Problem: Beamer+xelatex+\XeTeXdefaultencoding

[Стас Фомин]

Hello all!

I have full installation of Miktex 2.8.
This is my minimal working sample:

-------------------
\documentclass{beamer}
\XeTeXdefaultencoding "UTF-8"
\begin{document}
\end{document}

-------------------

This sample compiled by xelatex results to one waste page with
"@safe at act @safe at act".

Same problem if «\XeTeXdefaultencoding "cp-1251"».

What is wrong?

Thanks all in advance,
Sincerely, Stas Fomin