On Wed, Jul 23, 2008 at 4:46 PM, Alan Stone
Correction ( disregard the previous example)...
\setuppapersize [A4][A4]
%\setuppagenumbering[alternative=singlesided] \setuppagenumbering[alternative=doublesided]
\definepagebreak[myChapterPageBreak][yes,header,footer,right] \setuphead[chapter][page=myChapterPageBreak]
\startsectionblockenvironment[frontpart] \setupheader[state=stop] \setupfooter[state=stop] \stopsectionblockenvironment
\startsectionblockenvironment[bodypart] \setupheader[state=start] \setupfooter[state=start] \stopsectionblockenvironment
\startsectionblockenvironment[backpart] \setupheader[state=stop] \setupfooter[state=stop] \stopsectionblockenvironment
\setupsectionblock[backpart][before={\page[left]}]
You need \setupsectionblock[bodypart][page=yes] \setupsectionblock[backpart][page=yes,before={\page[left]}] The output from your settings is weird but correct because the last page of the bodymatter is a right page and with the default value for "page" you're going to the next right page, in your case page 11. On page 11 starts now the backmatter with empty header and footer lines, your setting for the backmatter inserts the "\page[left]" command and because we're at the moment on a right page the current page is empty and the back page is placed on page 12. You see, nothing is wrong with ConTeXt, only the settings for the sectionblocks are a bit confusing and you have to take care of this.
\starttext
\startstandardmakeup Title \blank[3*big] Author \stopstandardmakeup
\startfrontmatter Table of Contents \blank[3*big] \placecontent \stopfrontmatter
\startbodymatter \chapter{Chapter 1} \section{Section 1.1} \input knuth \blank \input knuth \blank \input knuth
\section{Section 1.2} \input tufte \blank \input tufte \blank \input tufte
\section{Section 1.3} \input zapf \blank \input zapf \blank \input zapf
\chapter{Chapter 2} \section{Section 2.1} \input knuth \blank \input knuth \blank \input knuth
\section{Section 2.2} \input tufte \blank \input tufte \blank \input tufte
\section{Section 2.3} \input zapf \blank \input zapf \blank \input zapf \stopbodymatter
\startbackmatter back page \stopbackmatter
\stoptext
Wolfgang