overlays and pstricks node connections

Hi,

I have noticed that when I use pstricks node connection commands like
\ncLine and \ncbar, they show up in every overlay even when I surround
them by overlay commands like \fromSlide.  I am running version 1.00.4
of prosper.

Is this a known bug?  Is there a workaround?

Here is some code I'd like to have work.  I'd like some of the node
connections and labels to only appear on the 2nd overlay.

\overlays{2}{
  \begin{slide}{Other approaches: list decoding}
    \begin{center}
      \begin{psmatrix}[colsep=1.2]
        [name=in] $m$ &
        [name=sender,colsep=.7] S &
        [name=chan] C &
        [name=ldec] LD &
        [name=recip,colsep=2.4] \fromSlide{2}{R} &
        [name=out,colsep=.7] \fromSlide{2}{$m$}
        \psset{nodesep=.1}
        \ncLine{->}{in}{sender}
        \ncLine{->}{sender}{chan}^{$x$}
        \ncLine{->}{chan}{ldec}^{$r$}
        \ncLine{->}{ldec}{recip}^{$z_1, \ldots, z_L$}_{$\exists i :
          z_i = m$}
        \fromSlide{2}{
          \ncLine{->}{recip}{out}
          \ncbar[angle=-90]{->}{sender}{recip}
          \Bput{side channel}
        }
      \end{psmatrix}
    \end{center}
  \end{slide}
}

thanks,
-Chris

- - -- --- ----- -------- ------------- ---------------------
Christopher J Peikert, MIT Computer Science & AI Lab, 32-G636
http://theory.csail.mit.edu/~cpeikert/
                 "A witty saying proves nothing." -- Voltaire


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