This test file ================================================== \setuplayout[leftmargindistance=0.125in, leftmargin=0.625in, width=4.75in, rightmargindistance=0.25in, rightmargin=0.25in] \setuphead[section][alternative=inmargin] \showframe \starttext \dorecurse{6}{\section{Blah} \input tufte } \stoptext ================================================== asks for section numbers in the left margin, separated from the section title by the leftmargindistance. It works fine for the first four sections. But sections 5 and 6 (on page 2) have the section number shifted further left from the correct position by roughly 10pt or so. It seems very sensitive to the layout. If I change the leftmargindistance to 0.25in, the section numbers are all placed correctly. I noticed the problem on my default context version: ConTeXt ver: 2013.05.28 00:36 MKIV current [from the Debian TL2013 pkgs] It also happens with the live ConTeXt and with vanilla TL2013. (Though it works fine with MKII.) Is this a bug, or just a change in setuphead that I didn't take account of? -Sanjoy