Sigh.  I should have mentioned that that I reinstalled LMTX from scratch on both machines, and that my mac is running macOS Monterey 12.3.1.

On Tue, May 24, 2022 at 3:40 PM T. Kurt Bond <tkurtbond@gmail.com> wrote:
Huh.  I tried it on a Linux box, and that worked.  But on my main machine, a Intel 64 bit mac, I get the original result.  Oh, I changed to use this input:
\definecolumnset[TwoColumns][n=2]
\startcolumnset [TwoColumns]
  \input knuth
\stopcolumnset

On Tue, May 24, 2022 at 3:09 PM Henning Hraban Ramm via ntg-context <ntg-context@ntg.nl> wrote:
Am 24.05.22 um 20:43 schrieb T. Kurt Bond via ntg-context:
> Given the following file that uses definecolumnset and
> startcolumnset/stopcolumnset (largely from the wiki
> <https://wiki.contextgarden.net/Command/definecolumnset>) for input:
>
>     %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
>     \setuppapersize[letter]
>     \definecolumnset[TwoColumns][n=2]
>     \startcolumnset [TwoColumns]
>        \title{Test page}
>        \framed
>          [frame=off,
>           bottomframe=on,
>           width=\textwidth,
>           frameoffset=1mm,
>           foregroundstyle=small,
>          ]{\copyright\ \date[][year] Donald E. Knuth}
>        \input knuth
>     \stopcolumnset
>     %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

That’s not a minimal example, but it works for me (even if the text
starts only on the second page):

\definecolumnset[TwoColumns][n=2]

\starttext
\startcolumnset [TwoColumns]
   \title{Test page}
   \framed
     [frame=off,
      bottomframe=on,
      width=\textwidth,
      frameoffset=1mm,
      foregroundstyle=small,
     ]{\copyright\ \date[][year] Donald E. Knuth}
   \samplefile{knuth}
\stopcolumnset
\stoptext

Hraban
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T. Kurt Bond, tkurtbond@gmail.com, https://tkurtbond.github.io