Graphics, Figures & Tables ⇒ How to use \fbox in a \caption with the subfig-package

[ge0rch]

Hey,
i use \fbox{} inside a \caption{} and without \usepackage{subfig} everything works just fine. since i want to use subfigures i get an error:
! Argument of \@tempa has an extra } \caption{test \fbox{test}}

any suggestions? minimal working example:
_____________________________
\documentclass[12pt]{book}
\usepackage{graphicx}
\usepackage{subfig}
\usepackage{tikz}

\begin{document}
\begin{figure}[!ht]
\tikz{\node at (0,0) {TEST};}
\caption{test \fbox{test}}
\label{fig:test}
\end{figure}
\end{document}

[ge0rch]

Hey guys,
i didn't find a solution in ohter fora and wonder if you get the same error?
i hope the tikz line doesn't prevent the code to be treated as a mwe

[ge0rch]

Good things come to those who wait...
The problem comes along with \caption[]{}. Including the subfig-packages and a missing first parameter in the caption command won't work! why ever?
______________________________________________________________________________________
[1] works

Code: Select all

\documentclass[12pt]{book}
%\usepackage{subfig}           % comment out 
\usepackage{tikz}
\begin{document}
\begin{figure}[!ht]
\tikz{\node at (0,0) {TEST};}
\caption{test \fbox{test}}     % here: \caption[missing]{}
\label{fig:test}
\end{figure}
\end{document}

______________________________________________________________________________________
[2] works not

Code: Select all

\documentclass[12pt]{book}
\usepackage{subfig}
\usepackage{tikz}
\begin{document}
\begin{figure}[!ht]
\tikz{\node at (0,0) {TEST};}
\caption{test \fbox{test}}      % here: \caption[missing]{}
\label{fig:test}
\end{figure}
\end{document}

______________________________________________________________________________________
[3] works

Code: Select all

\documentclass[12pt]{book}
\usepackage{subfig}
\usepackage{tikz}
\begin{document}
\begin{figure}[!ht]
\tikz{\node at (0,0) {TEST};}
\caption{test}                  % here: \caption[missing]{}, no \fbox{}
\label{fig:test}
\end{figure}
\end{document}

______________________________________________________________________________________
[4] works

Code: Select all

\documentclass[12pt]{book}
\usepackage{subfig}
\usepackage{tikz}
\begin{document}
\begin{figure}[!ht]
\tikz{\node at (0,0) {TEST};}
\caption[solution]{test \fbox{test}}   % here: \caption[not missing]{}
\label{fig:test}
\end{figure}
\end{document}

______________________________________________________________________________________