Thanks Aditya
On May 17, 2011, at 12:36 PM, Aditya Mahajan wrote:
>> 
> 
> Did you run this for TL ConTeXt or the minimals ConTeXt. From a terminal run
> 
> source /path-to-context/tex/setuptex
> mtxrun --generate
> 
> Then try compiling a test file from the terminal.


this works.


> 
>> Any suggestions? If all fails I'll try to clone an older installation.
> 
> What does `which context` return?


/Applications/ConTeXtMinimals/tex/texmf-osx-64/bin/context

Great! Thus the wiki info to create 
 an executable  file ConTeXt-MKIV.engine containing

#!/bin/bash
export PATH=/Applications/ConTeXtMinimals/tex/texmf-osx-intel/bin:$PATH
export TEXMFCACHE=/Applications/ConTeXtMinimals/tex/texmf-cache
context "$1"

in ~/Library/TeXShop/Engines
is slightly but catastrophically outdated. The file needs to read

#!/bin/bash
export PATH=/Applications/ConTeXtMinimals/tex/texmf-osx-64/bin:$PATH
export TEXMFCACHE=/Applications/ConTeXtMinimals/tex/texmf-cache
context "$1"


With that, TeXShop works with MKIV.

Thanks again !

Matthias