Am 29.04.2016 um 11:05 schrieb Wolfgang Schuster:

You need a newer context version.

OK, thank you, that helped. Everything is fine from the command line.

I seem to be overlooking something as to the setup of TeXworks, though. I copied the programme calls from the tools.ini that came with the ConTeXt standalone version into the present tools.ini that lives in my personal TeXworks config folder. I also added /usr/local/context/bin to the "paths for TeX and friends" in the TW preferences window.

Now TW starts the correct mtxrun, but the run crashes with, after a lot of file searching:

mtxrun | unknown script 'context.lua' or 'mtx-context.lua'

Cheers -- Thomas