[pstricks] Every Other Tick Again

[David Arnold]

All, Sometime back Herbert shared this example with me:

\documentclass{minimal}
\usepackage{pstricks-add}
\begin{document}

With pstricks-add:

\begin{pspicture}(-1,-1)(6,6)
\psaxes[showOriginTick=false,showorigin=false,Dx=2,Dy=2,subticks=2](6,6)
\end{pspicture}

\end{document}

I think the intent was to have ticks every one unit but label only  
the even ticks. However, the attached shows what I get:

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Am I in error thinking that the above code would do as I expected? Or  
is there a bug? Or an outdated pstricks-add?

David.