Hi,

This is based on a question on TeX.SE
https://tex.stackexchange.com/questions/326653/context-wrapfigure-interacts-with-marginrule

All marginrules except those of level 1 stop working after 
\placefigure[right]. Here is a minimal example:

\useexternalfigure[ctanlion][http://www.ctan.org/lion/ctan_lion_350x350.png][width=4cm]
\starttext

\placefigure[here,none,right]{}{\externalfigure[ctanlion]}
\input knuth

\startmarginrule[2]
   \input ward
\stopmarginrule

\startmarginrule[1]
   \input ward
\stopmarginrule

\startmarginrule[3]
   \input ward
\stopmarginrule

\stoptext

The output is attached.

Aditya