All, Is this a bug? %output=pdf \useMPlibrary[dum] \starttext \input tufte \placefigure [inmargin][fig:one] {A margin float.} {\externalfigure[placeholder][width=\marginwidth]} \dorecurse{5}{\input tufte \par} \stoptext I get: ! Undefined control sequence. <argument> \doinmargenormal \leftmarginfloat \rightmarginfloat {\box \floatb... \p!compareprocessactionC ...ommalistelement {#3}#2 \expandafter \quitprevcomm... \next2 #1,->\p!dodoprocessaction {#1} \doprocesscommaitem \doprocesscommalist ...item \gobbleoneargument #1, ]\relax \global \advance \... \next1 #1,->\p!doprocessaction {#1} \doprocesscommaitem \doprocesscommalist ...item \gobbleoneargument #1, ]\relax \global \advance \... ... l.12 ...alfigure[placeholder][width=\marginwidth]} ?