[pstricks] Difficulties with pst-pdf

[David Arnold]

All,

Consider:

\documentclass[12pt]{article}

%\usepackage{pst-pdf}
\usepackage{pst-bar}
\usepackage{pst-plot}
\usepackage{pst-tree}
\usepackage{pstricks-add}

\begin{document}
In the shaded box that follows, enter the inequality symbol $<$ or $> 
$ so that the resulting inequality is a true statement.

$-3\quad\psframe 
[linewidth=2pt,fillstyle=solid,fillcolor=lightgray,framearc=0.2](0,0) 
(0.5,0.5)\quad -2$

\end{document}

If I compile this with: simpdftex latex test.tex, I get this result:

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Now, if I uncomment %\usepackage{pst-pdf} and compile with: ps4pdf  
test.tex, I get this result:

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What is going on here?

As a second question, I am very open to suggestions to a better way  
of accomplishing the goal implied by the fragment. Can someone  
suggest a better way to get a little shaded box (with good alignment)  
between my integers?

Thanks.

David.