Dear list members, line numbering in a two column layout apparently conflicts with the marking mechanism. Consider the following example: \setupcolumns[n=2] \setuplinenumbering [ step=5, method=page, align=flushright, ] \definemarking[Test] \setupheadertexts[{\fetchmark[Test][top] -- \fetchmark[Test][bottom]}] \startbuffer \dorecurse{12}{words } \stopbuffer \starttext \startcolumns \startlinenumbering \marking[Test]{ONE}ONE \dorecurse{12}{\getbuffer}\par \marking[Test]{TWO}TWO \dorecurse{29}{\getbuffer}\par \marking[Test]{THREE}THREE \dorecurse{12}{\getbuffer}\par \stoplinenumbering \stopcolumns \stoptext In the result, the header of the first page reads "ONE -- THREE", despite marking "THREE" being placed in the third line of the second page. Without linenumbering, the header of the first page reads "ONE -- TWO", as is to be expected. Best regards, Oliver -- Dr. Oliver von Criegern Referat für IT und Digital Humanities Bayerische Akademie der Wissenschaften Alfons-Goppel-Str. 11 80539 München Tel.: 089-23031-1310