pstricks-add incompatible with beamer?

Question

Beamer seems to clash with pstricks-add:

\documentclass{beamer}
\usepackage{pstricks}
\usepackage{pstricks-add}

\begin{document}
 Lorem Ipsum
\end{document}

Gives the following error:

! No room for a new \dimen .
\ch@ck ...\else \errmessage {No room for a new #3}
                                                  \fi 
l.1895 \newdimen\pst@chartHeight

But it runs smoothly without pstricks-add or replacing beamer with article.