Pstricks stops working after update 18-2-19, problem with pgf?

Question

I tried to fix my problem with dotsymbols in pstricks (see my question) and end up with an update of several packages in miktex. Now (after update) pstricks stops working. I get the following error:

(C:\Users\flenk1\AppData\Roaming\MiKTeX\2.9\tex/generic/pgf/utilities\pgfkeysfi
ltered.code.tex
\pgfkeys@tmptoks=\toks20
))
(C:\Users\flenk1\AppData\Roaming\MiKTeX\2.9\tex/generic/pgf/utilities\pgffor.co
de.tex
Loading [

! LaTeX Error: Missing \begin{document}.

See the LaTeX manual or LaTeX Companion for explanation.
Type  H <return>  for immediate help.
 ...                                              

l.10 \ProvidesPackageRCS[v
                          \pgfversion] $Header: /cvsroot/pgf/pgf/generic/pgf...

? x

I tried the following compile commands:

C:\Program Files\MiKTeX 2.9\miktex\bin\x64\latex.exe
C:\Program Files\MiKTeX 2.9\miktex\bin\x64\xelatex.exe
C:\Program Files\MiKTeX 2.9\miktex\bin\x64\pdflatex.exe
C:\Program Files\MiKTeX 2.9\miktex\bin\x64\lualatex.exe

but all end up with the same error. Even after a complete reinstallation of miktex the same error remains.

My Minimum example is really minimal:

\documentclass{scrartcl}
\usepackage{pstricks}
\begin{document}
This is a test
\end{document}

Is there a possibility to switch back to an older version of pstricks or pgf? Most of my files use pstricks, so for me this error is catastrophic.

Thanks for any help.