[pstricks] Shifted lines when shadowed

[Raphael Clifford]

Does anyone know why the origin gets shifted after a line is shadowed?
There's an example below.  When the lines are drawn without a shadow they
are correctly placed but when they are shadowed the origin progressively
moves to the right.  

TeX (Web2C 7.3.1) 3.14159 kpathsea version 3.3.1
 
Pstricks: \def\fileversion{97 patch 10}
          \def\filedate{1999/03/24}


\documentclass{report}
\usepackage{pstricks}
\begin{document}
\begin{picture}(0,0)(7,7)

\psline[shadow=true](0,0.0)(3,0.0)
\psline[shadow=true](0,0.2)(3,0.2)
\psline[shadow=true](0,0.4)(3,0.4)
\psline[shadow=true](0,0.6)(3,0.6)
\psline[shadow=true](0,0.8)(3,0.8)

\psline[shadow=false](4,0.0)(7,0.0)
\psline[shadow=false](4,0.2)(7,0.2)
\psline[shadow=false](4,0.4)(7,0.4)
\psline[shadow=false](4,0.6)(7,0.6)
\psline[shadow=false](4,0.8)(7,0.8)

\end{picture}
\end{document}