# beamer doesn't work after upgrading to MiKTeX 2.9 – 20 error messages

After upgrading to MiKTeX 2.9 my beamer files stopped working. The code:

\documentclass{beamer}
\begin{document}
\begin{frame}
Hello
\end{frame}
\end{document}


Gives some 20 errors and two warnings, the first error being:

! Undefined control sequence.


and the first warning:

LaTeX Font Warning: Font shape OT1/cmss/m/n' in size <4> not available
(Font)              size <5> substituted on input line 3.


The log file is available here.

I have searched the web in vain, for example tried deleting the .aux file as suggested at Beamer - undefined control sequence, the solutions did not work.

-
Seems to be an issue with the hyperref package which is loaded by beamer. –  Martin Scharrer Apr 14 '11 at 14:57
Welcome to TeX.sx! +1 for a first question that you obviously put some thought into before posting; we'd love to see more of those questions! –  doncherry Sep 8 '11 at 16:27
update the package hyperref. If it is not available with MiKTeX (for TeXLive it was updated yesterday) try in the preamble:
\makeatletter\def\Hy@xspace@end{}\makeatother

\makeatletter\def\Hy@xspace@end{}\makeatother` –  Ulrike Fischer Apr 14 '11 at 15:02