textbackground broken?

textbackground broken?

[Hans van der Meer]

Is textbackground broken in mkiv? I need its usage (it seems the recommended way to do backgrounds).
The following minimal example fails.
Who is wrong? Is it me or is it ConTeXt?

ConTeXt  ver: 2011.11.04 14:15 MKIV  fmt: 2011.11.13  int: english/english

% Testing textbackground
\setuppapersize[A6]A6]
\definetextbackground[testbg][%
	background=color,backgroundcolor=yellow,%
	leftoffset=0pt,rightoffset=0pt,topoffset=0pt,bottomoffset=0pt,frame=on]
\starttext
\input tufte

\starttestbg
\input tufte
\stoptestbg

\input tufte
\stoptext

The error messages are:

metapost        > initializing instance 'metafun' using format 'metafun'
metapost        > loading 'metafun': /Users/hans/TeX/context/tex/texmf-context/metapost/context/base/metafun.mpiv
! terminal: ! Enormous number has been reduced.
<*> ...6.0pt ;  ;   ; prepare_multi_pars(2,2330878
                                                  ,22629721,0,683329,265737,...

! Enormous number has been reduced.
<*> ...;   ; prepare_multi_pars(2,2330878,22629721
                                                  ,0,683329,265737,2,5629963...

..
..


<inserted text> ...ainTextArea; ;;;;]===], false)}
                                                  
\processMPgraphic ...e ;\!!es , \MPaskedfigure )}}
                                                  \egroup \placeMPgraphic \d...
\useMPpositiongraphic ...tartMPcode #3\stopMPcode 
                                                  \egroup 
\doMPpositiongraphic ...riables \getvalue {MPG:#1}
                                                  }
\doMPpositiongraphic ...fined {MPG:#1}\donothing }
                                                  \removelastspace }\smashbo...
\dohandleMPpositiongraphicrange ...raphic {#3}{#4}
                                                  \fi \fi 
...
l.14 \stoptext

Hans van der Meer



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