Spacing problems (Overlays, pstricks)

Hi,

The following file has an unnecessary "shift" in
overlay 2.  I can work my way around it, but would
appreciate if someone can explain the reason.  I tried
to isolate one exact cause of the shift, but that was
difficult as more than a few factors seemed necessary,
such as drawing the nccurve, long enough sentences,
etc.  I don't even know which all are necessary.  In
anycase, this following file does have a shift.  The
shift can be removed by putting a newline just before
\FromSlide{3}%.

Thank you.

amic


%%%%
\documentclass[pdf,autumn,slideColor,colorBG]{prosper}
\usepackage{pstricks,pst-node,pst-text,pst-3d}
\begin{document}

\overlays{3}{%
\begin{slide}{Title}
\begin{pspicture}(2,2)
\pnode(1,1){A}%
\end{pspicture}

\onlySlide*{1}{%
Padded words required. Shift \rnode{B}{here}.%
\nccurve{B}{A}%
}%
\onlySlide*{2}{%
Padded words required. Shift \rnode{B}{here}.%
\nccurve{B}{A}%
}%
\FromSlide{3}%
Last overlay. Requires a long enough sentence.
\end{slide}
}%
\end{document}

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