The same example produces the problem for me.  Maybe I have an older version?  I got MacTex pretty recently (two weeks ago), but the version is:  2007.01.12 15:56.  Here's the exact source:

\definecombinedlist[content][chapter]
\setuplist[chapter][after={\startcolumns\placelist[section]\stopcolumns}]

\placecontent

\starttext
\dorecurse{3}
  {\chapter{Chapter}
   \dorecurse{4}{\section{Section}}}
\stoptext

Paul


Wolfgang Schuster wrote: 
On Wed, May 7, 2008 at 1:38 PM, Paul Gideon Dann
<pdgiddie@googlemail.com> wrote:
  
Thanks, that's genius!  However, the problem I now have is that the sections
from *both* chapters are displayed below each chapter heading.  That is,
\placelist[section] generates the same content in both contexts.
    

The followings works for me, give us a example.

\setuplist
  [chapter]
  [after={\startcolumns\placelist[section]\stopcolumns}]

\starttext

\placelist[chapter]

\dorecurse{3}
  {\chapter{Chapter}
   \dorecurse{4}{\section{Section}}}

\stoptext

Wolfgang
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