pstricks and pdf option

Question

I've noticed a problem with the latest version of pstricks: I used to compile files containing pstricks code with pdflatex, using the pdf option of the document class. Now it doesn't work,, and produces an error:

                                              %
! Undefined control sequence.
\XC@usec@lor ...\expandafter \c@lor@to@ps #1#2\@@
                                                  \else \expandafter \expand...
l.15 ...lor =IndianRed ]{0}{TwoPi}{0.5 + 2*cos(x)}
                                                  %
[1 Non-PDF special ignored! Non-PDF special ignored! Non-PDF special
ignored! Non-PDF special ignored! Non-PDF special ignored! Non-PDF
special ignored! Non-PDF special ignored! Non-PDF special ignored!

exactly as though auto-pst-pdf were not loaded. Loading auto-pst-pdf explicitly in the preamble, at the right place, solves the problem, but this means all files with pstricks code will have to be modified.

Does anyone know where this problem comes from, and if there is a solution?

Minimal working example:

\documentclass[11pt, a4paper, pdf, svgnames]{standalone}
    \usepackage[utf8]{inputenc}
    \usepackage[T1]{fontenc}
    \usepackage{fourier}
    \usepackage{ pst-plot}
% \usepackage{auto-pst-pdf}
\begin{document}

\psset{unit=2.5cm, arrowinset=0.15, ticksize=2.5pt -2.5pt, labelFontSize=\footnotesize, tickwidth =0.6pt}
\begin{pspicture}(-1.5,-1.9)(3.9,1.9)
    \psaxes[arrows=->, linecolor=LightSteelBlue, tickcolor=LightSteelBlue] (0,0)(-1.6,-1.9)(3.6,1.9)[$x$,-110][$y$,-140]
    \psset{linewidth=1.2pt, plotpoints=200, plotstyle=curve, polarplot, algebraic, labelsep=0.5em}
    \psplot[linecolor =IndianRed ]{0}{TwoPi}{0.5 + 2*cos(x)}%
\end{pspicture}

\end{document}