In the latest beta (2014.04.03 16:20) there are updates to the line numbering system that break its function in columns. (In the past it didn't work at all in many situations, not it works but in a buggy way). In the example below, the line numbering passes over everything twice resulting in two overlapping numbers for each line. \starttext \startlinenumbering \startcolumns \input{knuth} \stopcolumns \stoplinenumbering \stoptext