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I use combination of inputenc package (originally using 'latin2' encoding, but using 'utf8' encoding gives the same error) and fontenc package with T1 font encoding for writing LaTeX.

This combination gives strange bug when using 'Ł' or 'ł' (lslash) inside fragile frame.

Example code:

\documentclass{beamer}

\usepackage[utf8]{inputenc}
\usepackage[T1]{fontenc}

\begin{document}
\begin{frame}
  \frametitle{Non-fragile frame}
  Łł
\end{frame}
\begin{frame}[fragile]
  \frametitle{Fragile frame}
  Łł
\end{frame}
\end{document}

Compiling this document with LaTeX or PDFLaTeX gives the following error:

[1] (./beamer-test.vrb
! Undefined control sequence.
l.2   \T
        1\L \T1\l
?

Replacing ł with \l (or {\l}, or \l{}) generates correct output without any errors. In original 'latin2' (iso-8859-2) 8bit encoding there were no problems with any other Polish character, only with ł.

tetex-3.0-9.FC4
pdfeTeX 3.141592-1.21a-2.2 (Web2C 7.5.4)
beamer 3.01
fontenc 2004/02/22 v1.99f
inputenc 2004/02/05 v1.0d

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5  
you have a really old TeX installation. With current TeXLive2011 there is no problem. You should update at least beamer. – Herbert Nov 19 '11 at 13:07
Thanks a lot. Well, installing beamer requires installing pgfcore... – Jakub Narębski Nov 19 '11 at 13:13
1  
c'est la vie ... – Herbert Nov 19 '11 at 13:14
1  
@JakubNarębski The example worked for me too. Please tell us in a comment if updating solved it. We would close this question then. – Stefan Kottwitz♦ Nov 19 '11 at 13:27
@Herbert, @Stefan: Updating beamer (and installing pgf), or rather installing it locally to ~/texmf fixed the issue. Thanks. – Jakub Narębski Nov 19 '11 at 15:06
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closed as too localized by Alan Munn, Martin Scharrer♦ Nov 19 '11 at 18:54

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