Why am I getting a frame number of 2? [closed]

Question

Using tikz/matrix inside beamer, I have several slides with a wrong page/frame count.

Why is that so, and how can I avoid it?

MWE:

\documentclass[14pt]{beamer}
\usepackage{tikz}
\usetikzlibrary{matrix}

\setbeamertemplate{footline}{\insertframenumber/\inserttotalframenumber}
\begin{document}

\begin{frame}[fragile]
  \frametitle{Bar}
    \begin{tikzpicture}
    \matrix (m) [matrix of math nodes]
    {42&42\\23&23\\};
  \end{tikzpicture}
\end{frame}

\end{document}

This gives me a frame number of 2/2 even though there is only one slide. I use tikz/matrices to write (category theory-ish) diagrams with arrows because diagrams.sty didn't work in beamer, and then, I use [fragile] for the code to compile because of the &.

EDIT: I found a way to solve the problem, but I'm still interested in explications (and reproduction of the problem, as it seems not every one has this bug. I'm using TeTex and beamer-3.07, both from the FreeBSD ports, so maybe it's a compatibility bug or an old version issue…)

Answer 1

In 2006, support for teTeX has been stopped. I recommend installing TeX Live 2011, which is also available for FreeBSD. It also contains a newer version of beamer. With TeX Live, I get the correct behavior for your example, a single frame numbered 1/1.

Answer 2

Hum, the following solved the issue, for some reason.

\begin{frame}
  \frametitle{Bar}
    \begin{tikzpicture}[ampersand replacement=\&]
    \matrix (m) [matrix of math nodes]
    {42\&42\\23\&24\\};
  \end{tikzpicture}
\end{frame}