A reference to the text of a multi-line heading takes on the line breaks 
of the heading when \definereferenceformat[about] is used.

    \definereferenceformat[about][type=title,left=,right=]
    \starttext
    \startsection[reference={sec:one},
       title={Three\\line\\title}]
    \startparagraph
    See \about[sec:one].
    \stopparagraph
    \stopsection
    \stoptext

Can this be repaired? Or, am I doing it wrong?

-- 
Rik