Hi Hans,

transparency in MetaPost is broken here. No \scratchdimen involved this time... ;)

MtxRun | current version: 2009.01.07 00:35
This is LuaTeX, Version snapshot-0.32.0-2009010322, build 1724

Regards,  Peter
\setupcolors[state=start]
\definecolor[ghost] [a=1,t=.7,s=1]

\starttext
\startMPcode
  fill unitsquare xyscaled(3cm,3cm) withcolor red;
  fill unitsquare xyscaled(1cm,1cm) withcolor \MPcolor{ghost}; % broken
\stopMPcode

\framed[background=color,backgroundcolor=red,foregroundcolor=ghost]{A 
transparency test} % OK
\stoptext
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