Broken output with xetex

Broken output with xetex

[Diego Depaoli]

What goes wrong with this code using xetex engine?
No issues with pdftex and luatex.

\setupcolors[state=start]
\definecolor[a][yellow]
\definecolor[b][s=.4]
\definecolor[c][darkyellow]
\definecolor[d][green]
\definecolor[e][s=.4]
\definecolor[f][darkgreen]
\defineoverlay[my shade][\uniqueMPgraphic{MyShade}]
\defineoverlay[circular shade][\uniqueMPgraphic{CircularShade}]
\defineoverlay[linear shade] [\uniqueMPgraphic{LinearShade}]
\startuniqueMPgraphic{LinearShade}
  path p ;
  p := unitsquare xscaled \overlaywidth yscaled \overlayheight ;
  linear_shade(p,0,\MPcolor{a},\MPcolor{b});
\stopuniqueMPgraphic
\startuniqueMPgraphic{CircularShade}
  path p ;
  p := unitsquare xscaled \overlaywidth yscaled \overlayheight ;
  circular_shade(p,2,\MPcolor{a},\MPcolor{b}) ;
  \stopuniqueMPgraphic
  \startuniqueMPgraphic{MyShade}
  path p ;
  p := unitsquare xscaled \overlaywidth yscaled \overlayheight ;
circular_shade(p,3,\MPcolor{f},\MPcolor{e}) ;
\stopuniqueMPgraphic
\starttext
\framed[background=circular shade]
{frame 1}
\framed[background=linear shade]
{frame 2}
\framed[background=my shade]
{frame 3}
\stoptext

Cheers
-- 
Diego Depaoli
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