This is the error when installing the latest beta: ! Undefined control sequence. system > tex > error on line 808 in file /Users/hans/TeX/context-new/tex/texmf-context/tex/context/base/context.mkiv: Undefined control sequence ... <argument> \??bj \setsomevalue #1#2->\expandafter \def \csname #1 #2\endcsname \p!doassign ...fter \setsomevalue \fi \fi {#1}{#2} {#3} \xprocesscommaitem ...@relax@ #1==\empty \@relax@ \doubleexpandafter \xproce... <argument> \c!n =3, \c!width =1em, \c!height =1ex, \c!depth =\!!zeropoint , ... \xdogetparameters #1]->\xprocesscommaitem #1 ,],\@relax@ l.808 \c!color=] Is it possible the error is in file typo-mar.mkiv? There I find a macro call \usemargindatastyleandcolor\c!style\c!color but searching the sourcesfor its definition does not reveal it. Could it be forgotten? Hans van der Meer