Dear Hans,
For your information it seems that in the latest beta, textbackground is
broken: minimal example below, and the output can be found here:
http://dl.dropbox.com/u/4316076/textbackground-bug.pdf
Best regards: OK
%%% begin textbackground-bug.tex
\starttext
\definetextbackground[test][backgroundcolor=lightgray]
\starttextbackground[test]
\input ward
\input ward
\stoptextbackground
\stoptext
%%% begin textbackground-bug.tex
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