Hi again, After I had some issues with \externalfigure, Hans suggested to me that I use a newer version of ConTeXt. So, rather than using the latest current (which seems to be from May 2011) ConTeXt ver: 2011.05.18 18:04 MKIV fmt: 2011.12.6 int: english/english I am not using the latest beta ConTeXt ver: 2012.03.29 11:28 MKIV fmt: 2012.3.29 int: english/english However, as it turns out, the document I am working on is no longer processed without errors. I butchered my document to isolate the error and come up with a (close to) minimal example: % Use UTF encoding \enableregime[utf] % Set English as the language \language[en] % Select A4 as the paper size \setuppapersize[A4] % Setup the header... \setupheadertexts[chapter][section] \setupheader[leftwidth=.5\hsize, rightwidth=.4\hsize] \starttext \startfrontmatter \completecontent \chapter{Purpose and Scope} \section[]{Purpose} This document should be read in conjunction with bla bla bla... \stopfrontmatter \stoptext I get the following error when processing with the aforementioned version: <argument> doifelsemarking("\ascii ") \ctxcommand #1->\directlua \zerocount {commands.#1 } \page_layouts_process_element_single_limited ...i {\limitatetext {\getmarkin... \page_layouts_process_element_single_indeed ...#4} \fi \endgroup \page_layouts_process_element_single ...#1#2#3{#4} \fi <argument> ...\layoutelementparameter \c!lefttext \hss }\hskip -\makeupwidth... ... l.18 \chapter{Purpose and Scope} Strangely enough, all works well when I remove (or comment) the \setupheader line. Is there anything strange I am doing here? Should work, right? Any pointers would be appreciated. Thank you, Malte.