[NTG-context] makempy - graphictext failing?

[Awkster at aol.com]

I've recently installed context after seeing it for the first time at 
Practical Tex2004
Installation seems to have worked but some metapost code is failing to 
produce output.  Code is provided below:
Platform(s)/OS:
SuSE 8.1 linux with TeXLive
Windows 2000 with TeXLive
command line: texexec testMP

Is there a problem with the source code or might it be with my installation?
Thanks.

D. Claudio

%%%Code Follows%%%%%%%%%%
% interface=english output=pdftex
% Filename: testMP.tex
\setupcolors[state=start]
\starttext

\startMPgraphic
  graphictext "MP" scaled 8
  withdrawcolor .7blue withfillcolor .7white
  dashed evenly withpen pencircle scaled 2pt ;
\stopMPgraphic
\loadcurrentMPgraphic
\placeMPgraphic

\stoptext
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