Hi,
margindata have stopped to work in the latest beta. Simple test
\setuplayout [leftmargin=2cm]
\starttext
Thus, I came to the conclusion that the designer of a new system must not only be the implementer and first large-scale \inleft{100}user; the designer should also write the first user manual.
\stoptext
works with 2015.07.24 13:58, no output in margin with 2015.08.04 01:25
All best
Thomas