[pstricks] pstricks-add breaks latex-beamer?

[Hendri Adriaens]

> you need beamer 3.0 which is not compatible with your one ... :-(

Thanks for the minimal example.

Basically, I can reproduce an error only with version 1.7 of
xkeyval which is private (and for good reasons). Hence I still
do not understand the problem of Matthias, but I will work on
this one first.

-Hendri.