Pesky colortbl problem

Greetings.  I'd like to make a prosper slide containing a table with
colored background shading of certain cells, but I'm unable to get to
first base using the colortbl package with prosper.  Henri recently posted
the following as code that works:

---------------------------------------------------------------------------
\documentclass[final,pdf,slideColor,colorBG,frames]{prosper}
\usepackage{colortbl}
\begin{document}

\overlays{2}{
\begin{slide}{Color Table}

\begin{tabular}{|c|c|}
\hline
100  &   +0,16    \\ \hline
120  &\cellcolor{red}  +0,06    \\ \hline
140  &\fromSlide*{2}{\cellcolor{blue}}   +0,06    \\ \hline
\end{tabular}
\end{slide} }

\end{document}
---------------------------------------------------------------------------

But on my system (OzTeX 5.1), I keep getting a cryptic "Missing
\begin{document}" error message, even though the \begin{document} is
clearly there.  The last few lines of the log-file read:

---------------------------------------------------------------------------
) (TeX/Inputs/LaTeX/graphics/color.sty
Package: color 1999/02/16 v1.0i Standard LaTeX Color (DPC)

(TeX/Inputs/LaTeX/graphics/color.cfg
File: color.cfg 2001/08/31 v1.1 color configuration of teTeX/TeXLive
)
Package color Info: Driver file: dvips.def on input line 125.
 (TeX/Inputs/LaTeX/graphics/dvipsnam.def
File: dvipsnam.def 1999/02/16 v3.0i Driver-dependant file (DPC,SPQR)
)

! LaTeX Error: Missing \begin{document}.

See the LaTeX manual or LaTeX Companion for explanation.
Type  H <return>  for immediate help.
 ...

l.159   \definecolor{black}{gray}{0}

? x
---------------------------------------------------------------------------

The line 159 in question appears in color.sty.  I was able to get colortbl
to work normally in a simple non-prosper document.  Any insights about
what's wrong?

Tom Koepsell

---------------------------------------------------------------------------
Thomas Koepsell, MD, MPH            Mailing address:
Professor, Epidemiology               Department of Epidemiology
Professor, Health Services            Box 357236
Adjunct Professor, Medicine           University of Washington
Phone: 206-543-8830                   Seattle, WA 98195-7236
FAX:   206-543-8525                 For courier delivery:
                                      Health Sciences Building, F-261F
                                      University of Washington
                                      1959 N.E. Pacific Street
                                      Seattle, WA 98195
---------------------------------------------------------------------------



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