incompatible list can't be unboxed with every beamer document

Hi there,

I'm using an up to date MiKTeX 2.7 with additional installed CVS version
of PGF, namely the prepacked build from texample.net from 2009-06-02.

It is practically impossible to compile any latex beamer document, for
example:

  \documentclass{beamer}
  \begin{document}
  \begin{frame}{Motivation}
    \begin{itemize}
      \item Instant Messenger (Jabber, ICQ, etc.)
      \item mehrere Desktop-Rechner
      \item \emph{verteilte} History :-(
    \end{itemize}
  \end{frame}
  %\begin{frame}{Ergebnis}
  %  \begin{itemize}
  %    \item bar
  %  \end{itemize}
  %\end{frame}
  \end{document}

This compiles as long as I don't add the second frame by removing the
comment chars. If I do I get the following error:

  Incompatible list can't be unboxed.

This doesn't occur with the older pgf version shipped with MiKTeX. I
don't know wheter this is a problem of beamer or pgf, so I crosspost
over bost lists.

Is there any workaround for this? beamer is in fact unusable in this
combination with recent PGF. :-(

Greets
Alex

--
***** http://www.lespocky.de *******************************************
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a little temporary Safety, deserve neither Liberty nor Safety.
                                (Benjamin Franklin)



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