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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