[pstricks] pstricks.sty : problems with the colors

[MLuque5130 at aol.com]

The new version of PSTricks creates problems with colors defined with  
postscript.
I use a macro of the type: 
 
newcommand{\NewColorRGB}[2]{\@newcolor{#1}{#2 setrgbcolor}}

it worked very well previously. 
That always works in the following example, but does not work if I call  
PSTricks by \usepackage{pstricks}:
 
The cause seems to be in pstricks.sty.
 
Can you find a solution of this problem ?
 
Manuel Luque
 
\documentclass{minimal}
%\usepackage{pstricks}
\input{pstricks.tex}
 
\makeatletter
\newcommand{\NewColorRGB}[2]{\@newcolor{#1}{#2  setrgbcolor}}
\makeatother
 
\begin{document}
\NewColorRGB{MyColorTest}{0.5 0.5 add % red    100%
1 2 div     % green  50%
1 4 div     % blue  25%
}
\begin{pspicture}(10,6)
\psline[linecolor=MyColorTest](10,6)
\end{pspicture}
\end{document}
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