Hi,
It seems there is a bug with the command \blank in the latest standalone
context.
If you compile with ConTeXt (texlive 2015), the result is as expected.
Thank you,
Fabrice
\setuppagenumbering[location=]
\setupcolors
[state=start]
\definecolor[MyColorB][c=0.00, m=0.62, y=1.00, k=0.00]
\definecolor[MyColorA][.75(MyColorB,white)]
\definecolor[MyColorC][c=0.3, m=0.00, y=0.00, k=0.05]
\defineframedtext
[MyDefinition]
[before={\blank},
after={\blank},
frame=off,
background=MyFrame,
width=\textwidth,
height=fit,
location=left,
style=italic]
\defineoverlay
[MyFrame]
[\useMPgraphic{MyFrame}]
\definelabel
[Définition]
[headstyle=\bf\smallcaps]
\startuseMPgraphic{MyFrame}
path b ;
picture p ;
p := textext.rt("\white\Définition") ;
p := p shifted (2BodyFontSize,OverlayHeight-ypart center p+.25ExHeight)
;
b := boundingbox p leftenlarged .5EmWidth rightenlarged .5EmWidth ;
fill OverlayBox withcolor \MPcolor{MyColorA} ;
fill b withcolor \MPcolor{MyColorC} ;
draw p ;
\stopuseMPgraphic
\starttext
\startchapter
[title={Chapter one}]
\startMyDefinition
\input knuth
\stopMyDefinition
\stopchapter
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