Dear Wilfred,
*File List*
minimal.cls 2001/05/25 Standard LaTeX minimal class
pstricks.sty 2013/04/05 v0.54 LaTeX wrapper for `PSTricks' (RN,HV)
pstricks.tex 2013/04/05 v2.40 `PSTricks' (tvz,hv)
pst-xkey.tex 2005/11/25 v1.6 PSTricks specialization of xkeyval (HA)
xkeyval.sty 2012/10/14 v2.6b package option processing (HA)
xkeyval.tex 2012/10/14 v2.6b key=value parser (HA)
pst-fp.tex 2013/04/05 v2.40 `PST-fp' (hv)
xcolor.sty 2007/01/21 v2.11 LaTeX color extensions (UK)
color.cfg 2007/01/18 v1.5 color configuration of teTeX/TeXLive
xetex.def 2013/02/04 v0.95 LaTeX color/graphics driver for XeTeX (RRM/JK)
pst-labo.sty 2005/03/13 package wrapper for pst-labo.tex (hv)
pst-labo.tex 2006/08/16 v2.03 `PST-labo' (ML,DG,CJ,hv)
pst-laboObj.tex
***********
Probably you have succeeded because pstricks is old.
I also succeeded in the case of old pstcicks.
Here the file lists are
*File List*
minimal.cls 2001/05/25 Standard LaTeX minimal class
pstricks.sty 2013/05/22 v0.57 LaTeX wrapper for `PSTricks' (RN,HV)
pstricks.tex 2013/07/09 v2.45 `PSTricks' (tvz,hv)
pst-xkey.tex 2005/11/25 v1.6 PSTricks specialization of xkeyval (HA)
xkeyval.sty 2012/10/14 v2.6b package option processing (HA)
xkeyval.tex 2012/10/14 v2.6b key=value parser (HA)
pst-fp.tex 2013/07/09 v2.45 `PST-fp' (hv)
xcolor.sty 2007/01/21 v2.11 LaTeX color extensions (UK)
color.cfg 2005/10/12 v1.3b color configuration of teTeX/TeXLive, extended
for XeTeX
xetex.def 2013/04/29 v0.96 LaTeX color/graphics driver for XeTeX (RRM/JK)
pst-labo.sty 2005/03/13 package wrapper for pst-labo.tex (hv)
pst-labo.tex 2006/08/16 v2.03 `PST-labo' (ML,DG,CJ,hv)
pst-laboObj.tex
***********
Best regards,
Akira KAKUTO
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