Help with the (non-existent) points in the numbering of parts and appendices

Hallo all,

First of all a lot of thanks to the authors of this excellent *european* package.

I have the following problem that I cannot find a way to address and need the help of the KOMA-Script community ;-)

I try to get the typographically correct behaviour of pointed headers in parts and appendices, as the manual of KOMA-Script and Duden says. Nevertheless, even though the numbers in the headers of chapters and (sub)sections do not have a point (correct!), the same behaviour is true for parts and appendices (wrong!!). All of these after not 2, but 202 LaTeX runs!!

I am going crazy! I also tried the following absolutely basic example and the same undesired behaviour is still there:

\documentclass{scrbook}

\begin{document}
\chapter{First Chapter}
\section{First Section}
\appendix
\chapter{First appendix}
\chapter{Second appendix}
\end{document}

for the history, I compiled n times with "latex a.tex", where n->oo

What can be wrong or what am I missing? I am using a non-hacked installation of MikTeX 2.5...

Thanks in advance!