All, This: %output=pdf \definehead[david][section] \setuphead[david][ownnumber=yes] \starttext \chapter{One} \input tufte \section{Two} \input tufte \david{Three} \input tufte \section{Four} \input tufte \stoptext Causes this: ! TeX capacity exceeded, sorry [input stack size=5000]. <argument> \s!section -3 \previoussection #1->\csname \??se #1 \c!before \endcsname \countervalue #1->\csname #1 \endcsname \@@longsectionnumber ...?se \previoussection {#1}} >\zerocount \csname \previ... \finalsectionnumber ...alue {\@@sectie \c!number } \fi \fi \@@shortsectionnumber ...1\c!ownnumber \endcsname \fi ... l.14 \david{Three} Any ideas?