Fehlende Labels an Achsen für Plot

Beispiel 1 funktioniert, Beispiel 2 compiliert korrekt, gibt aber keine Labels aus, Beispiel 3 führt zum angegebenen Fehler

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
\documentclass[pstricks]{standalone}
\usepackage{pst-plot}
\begin{document}
%Beispiel 1
\begin{pspicture}[showgrid=true](-1,-3)(3,3)
\psaxes[yLabels={,a,b}](0,0)(2,2)  
\end{pspicture}
%Beispiel 2
\begin{pspicture}[showgrid=true](-1,-3)(3,3)
  \psaxes[yLabels={,a,b}](0,0)(2,-2)  
\end{pspicture}
%Beispiel 3
%\begin{pspicture}[showgrid=true](-1,-5)(3,3)
%  \psaxes[yLabels={,a,b,c,d}](0,0)(2,-4)  
%\end{pspicture}
%ERROR: TeX capacity exceeded, sorry [input stack size=5000].
\end{document}
 
 
הההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההה
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX

Ich nutze Tex Live 2012. Ist das ein Bug oder mache irgendwas falsch?