Hi list, after an upgrade to latest beta today ConTeXt mkiv is failing with ! Undefined control sequence system > tex > error on line 165 in file file.tex: Undefined control sequence ... l.165 \startstructureblockenvironment [frontpart] The corresponding lines from the file.tex are: \definestructureconversionset[frontpart:pagenumber][][romannumerals] \definestructureconversionset[bodypart:pagenumber] [][numbers] \setuplist[chapter][pageconversionset=pagenumber] \startstructureblockenvironment[frontpart] \setupuserpagenumber[numberconversion=romannumerals] \setuppagenumber[number=1] \stopstructureblockenvironment \startstructureblockenvironment[bodypart] \setuppagenumber[number=1] \stopstructureblockenvironment \setupbackgrounds[header][text][frame=off,bottomframe=on] \setuppagenumbering[state=start,conversion=romannumerals] \startfrontmatter \completecontent \stopfrontmatter \startbodymatter \setuppagenumbering[state=start,conversion=] \product prd_file \stopbodymatter I would appreciate any kind of help to get this solved, as the wiki explained that for making use of the romannumbers in the frontpart and normals in the mainpart... Thanks for your help :) -- Martin 'golodhrim' Scholz Auf dem Sattler 4 34516 Ederbringhausen Germany Phone: +49 6454 799623 mobile: +49 176 63301749 Fax: +49 6454 7990138 e-Mail: scholz.m82@googlemail.com You ain't learning nothing when you're talking.