[OS X TeX] Every Other Tick in PSTricks

[David Arnold]

All, Consider the following code:

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

\listfiles

\begin{document}

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

\end{document}

When I run this in Texshop 2.20, I get this image;

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When I compile in the terminal with latex->dvips->ps2pdf, I get the  
correct image which looks like this:

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Indeed, when I drag the first image from Texshop's previewer and drop  
it on Acrobat, I also get the second image. Why isn't the first image  
showing up properly in the Texshop previewer?

David.