[OS X TeX] microtype and tracking smallcaps don't work as desired

[Michael Hoppe]

Dear TeXperts,

consider the two files

%%%%%%%%%%%  fehler.tex  %%%%%%%%%%%%%%%%%%%%%%%%%
\documentclass{article}
\usepackage[tracking=smallcaps,letterspace=300]{microtype}
\input{ddt}
\begin{document}

\textsc{AAAAAAAAAAAAAAA}

\copy\scbox

\end{document}
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

whereas contents is

%%%%%%%%%%%%%  ddt.tex  %%%%%%%%%%%%%%%%%%%%%%%%%%%%
\newbox\scbox \setbox\scbox=\hbox{{\textsc{AAAAAAAAAAAAAAA}}}
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

Then notice that

     \textsc{AAAAAAAAAAAAAAA}

is letterspaced, but

     \copy\scbox

isn't.  Am I doing something wrong?  Putting \input{ddt} after  
\begin{document} works as desired.



Michael