I got the following error in the minimal example (which is all shown in the output below) system > tex > error on line 4 in file simpl.tex: Undefined control sequence ... 1 \setuphead[section][before={\column}] 2 \starttext 3 \startcolumns[n=2] 4 >> \section{this is a section} 5 \section{another section in a new column} 6 \stopcolumns 7 \stoptext 8 \208>multicolumn:yes ->\par {\testrulewidth \zeropoint \ruledvskip \textheig... \page_breaks_columns_process ...dle_direct \v!yes \fi \relax \the \everyafte... <to be read again> \relax \dohandleheadpagebreakyes ...ter \c!before \relax \doif {\headparameter \c!a... \docheckheadbefore ...se \continuoussectionhead #1 \fi \doheadspacingbeforeyes ...handleheadpagebreakyes \headparameter \c!inbetwee... ... l.4 \section{this is a section} Basically, the first line in the file introduces the error. It worked a few weeks ago.