\bm{...} glyphs printed twice with weird offset (bm package)

[baloe]

\documentclass[cdmath=off]{tudscrartcl}
\usepackage{bm}
\begin{document}
$\bm{a}$
\end{document}

produces incorrect output

\documentclass{scrarticle}
\usepackage{bm}
\begin{document}
$\bm{a}$
\end{document}

produces correct output

Version v2.06j

[mrpiggi]

I'm working on it, but I don't have much time at the moment. I hope to have it done by the end of next week.