[pstricks] Using pscol with prosper

[Faton Berisha]

Hi,
 
I have recently updated my MiKTeX installation and found out that now
there is a conflict between the prosper class and pstcol style. The
following code
 
\documentclass{prosper}
\usepackage{pstcol}
 
\begin{document}
Bla
\end{document}
 
gives an error:
 
! LaTeX Error: Missing \begin{document}.
...                                              
l.159   \definecolor{black}{gray}{0}
 
(while processing the file C:\texmf\tex\latex\graphics\color.sty).
 
I used to compile the above code without any problems in the previous
installation.
 
Is there something I am missing? If not, could you please help me with a
suggestion of a more suitable slide producing package while using
pstricks.
 
Best regards,
Faton Berisha
 
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