[pstricks] dashed lines stopped working?

[Brandon Kuczenski]

Sorry to trouble the list with a stupid debugging question, but I need 
some help.  The following very simple file fails with a stack underflow on 
my up-to-date TeXlive 2011 system.  The file builds normally if I change 
linestyle to solid.  Any help?

File:

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

\listfiles
\begin{document}
\begin{pspicture}(0,0)(12,8)

\newpsstyle{lane}{linecolor=black,linestyle=dashed,dash=5pt 4pt}

\rput(6,4){%

   \pnode(-2,0){pLL}
   \pnode(2,0){pLR}
   \psline[style=lane](pLL)(pLR)
}
\end{pspicture}
\end{document}


Error:
Error: /stackunderflow in --exch--
Operand stack:
    y1
Execution stack:
    %interp_exit   .runexec2   --nostringval--   --nostringval-- 
--nostringval--   2   %stopped_push   --nostringval--   --nostringval-- 
--nostringval--   false   1   %stopped_push   1878   1   3   %oparray_pop 
1877   1   3   %oparray_pop   1861   1   3   %oparray_pop   1755   1   3 
%oparray_pop   --nostringval--   %errorexec_pop   .runexec2 
--nostringval--   --nostringval--   --nostringval--   2   %stopped_push 
--nostringval--   --nostringval--   --nostringval--
Dictionary stack:
    --dict:1159/1684(ro)(G)--   --dict:0/20(G)--   --dict:115/200(L)-- 
--dict:180/300(L)--   --dict:38/200(L)--   --dict:109/200(L)--
Current allocation mode is local
Last OS error: 2
Current file position is 169119
GPL Ghostscript 8.71: Unrecoverable error, exit code 1



Listfiles output:
  *File List*
  article.cls    2007/10/19 v1.4h Standard LaTeX document class
   size10.clo    2007/10/19 v1.4h Standard LaTeX file (size option)
pstricks-add.sty    2010/02/11 v. 0.14 package wrapper for 
pstricks-add.tex (hv
)
pstricks.sty    2011/04/23 v0.50 LaTeX wrapper for `PSTricks' (RN,HV)
    ifpdf.sty    2011/01/30 v2.3 Provides the ifpdf switch (HO)
ifluatex.sty    2010/03/01 v1.3 Provides the ifluatex switch (HO)
pstricks.tex    2011/04/23 v2.20 `PSTricks' (tvz,hv)
pst-xkey.tex    2005/11/25 v1.6 PSTricks specialization of xkeyval (HA)
  xkeyval.sty    2008/08/13 v2.6a package option processing (HA)
  xkeyval.tex    2008/08/13 v2.6a key=value parser (HA)
   pst-fp.tex    2011/04/23 v2.20 `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
    dvips.def    1999/02/16 v3.0i Driver-dependant file (DPC,SPQR)
pstricks-add.tex    2011/02/02 v3.51 `PSTricks-add' (hv)
  ***********