All, This from the Metafun manual: \setupoutput[pdf] \runMPgraphicstrue \setupcolors[state=start] \startuseMPgraphic{FunnyFrame} picture p; numeric w, h, o; p:=textext.rt(\MPstring{FunnyFrame}); w:=OverlayWidth; h:=OverlayHeight; o:=BodyFontSize; p:=p shifted (2o,h-ypart center p); draw p; drawoptions (withpen pencircle scaled 1pt withcolor .625red); draw (2o,h)--(0,h)--(0,0)--(w,0)--(w,h)--(xpart urcorner p, h) ; draw boundingbox p; setbounds currentpicture to unitsquare xyscaled (w,h); \stopuseMPgraphic \defineoverlay[FunnyFrame][\useMPgraphic{FunnyFrame}] \defineframedtext[FunnyText][frame=off,background=FunnyFrame] \def\StartFrame{\startFunnyText} \def\StopFrame{\stopFunnyText} \def\FrameTitle#1% {\setMPtext{FunnyFrame}{\hbox spread 1em {\hss\strut#1\hss}}} \setMPtext{FunnyFrame}{} \starttext \FrameTitle{Zapf (1)} \StartFrame Coming back to the use of typefaces in electronic publishing: many of the new typographers receive their knowledge and information about the rules of typography from books, from computer magazines or the instruction manuals which they get with the purchase of a PC or software. \StopFrame \stoptext Is producing this "funny" error:

...

unknown picture p textext.rt ! Equation cannot be performed (unknown picture=numeric). <to be read again> ( l.211 p:=textext.rt( "\hbox spread 1em {\hss \strut Zapf (1)\hss }"); ?

Any ideas?