https://github.com/melmothx/context-unofficial-test-suite/blob/master/src/mk... fails to compile, but it's not a regression since TL, where it fails too. Cheers system > tex > error on line 20 in file sets-001.tex: Missing number, treated as zero ... 10 11 \showframe 12 13 \starttext 14 15 \setuppagenumbering[alternative=doublesided]] 16 \definecolumnset[mycolumnset][n=2] 17 \definecolumnsetarea[einschub][left][x=1,y=1,nx=3,ny=20,background=contrast,state=start,leftoffset=1cm,rightoffset=1cm] 18 19 \startcolumnset[mycolumnset] 20 >> \dorecurse{15}{\input tufte\par} 21 \stopcolumnset 22 23 \stoptext 24 25 <to be read again> \advance \docalculatecolumnsetspan ...c!backspace \advance \!!widtha \namedlayoutpara... \dodoplacecolumntextareas ...lculatecolumnsetspan \!!heighta \columntextarea... \docommand ...oplacecolumntextareas {#1}{\v!left } \else \doglobal \removefro... \9>>1 #1,->\docommand {#1} \syst_helpers_do_process_comma_item \syst_helpers_do_process_comma_list ...rgument #1, ]\relax \global \advance \... ... l.20 \dorecurse{15}{\input tufte\par} ? X -- Marco