4:32 PM
How to delete it?

@chishimotoji: Ask Hebert. He is the only person who can fix it.

2 hours later…
6:36 PM
\documentclass[pstricks,border=15pt]{standalone}

\begin{document}
\begin{pspicture}[showgrid=true,arrowinset=0,arrows=->](5,5)
\psline(1,1)(1,1)
\psarc[linecolor=red](2.5,2.5){1}{0}{0}
\psarcn[linecolor=blue](2.5,2.5){2}{0}{0}
\psellipticarc[linecolor=green](2.5,2.5)(1,2){0}{0}
\psellipticarcn[linecolor=magenta](2.5,2.5)(2,1){0}{0}
\end{pspicture}

\begin{pspicture}[showgrid=true,arrowinset=0,arrows=->](5,5)
\psline(1,1)(1,1)
\psarc[linecolor=red](2.5,2.5){1}{0}{!0}
\psarcn[linecolor=blue](2.5,2.5){2}{0}{!0}
Bugs in PSTricks. You must report these bugs to Mr. Herbert.

2 hours later…
8:49 PM
@GodMustBeCrazy I think after Herbert Voss you are the greatest expert in PSTricks.
Hello @egreg I see you must have entered this room also after seeing the title. =)

9:06 PM
@JasperLoy Of course. :-)

@JasperLoy: Yes. I will maintain PSTricks in the future.