To prevent misunderstandings: This is /not/ the solution, the problem 
remains that the newly installed standalone mtxrun doesn't find certain 
configuration files and complains about an outdated something or other, 
/when started from within TeXworks/, while everything works fine from 
the command line.

Am 07.05.2016 um 12:49 schrieb Thomas Fehige:
> Am 06.05.2016 um 10:04 schrieb Mojca Miklavec:
>> Can you check the paths in the fourth tab (= Typesetting) of 
>> Preferences/Settings? It is possible that you have more than one 
>> version of ConTeXt installed and that you see different paths in the 
>> Terminal than in the GUI. Mojca
>
> Yes I have two versions of ConTeXt. I have TeXlive from the Ubuntu 
> repository and now the newer version as standalone. I added the paths 
> to the new version at the top of that list in TeXwoks' preferences. 
> And it does find and run the new version of mtxrun.
>
> Cheers -- Thomas
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