Thanks Vafa, working like a charm now For the common good: commenting out the line
\...@ifclassloaded{book}{\@ifpackageloaded{flowfram}{}{\input{book-xetex-bidi.def}}}{} in xetex-bidi.def seems to solve (at least some) current conflicts between bidi (via arabxetex) and titlesec, even with a complex titlesec setup and lots of other packages loaded. Using bidi v.1.1.6 May have to do with the redefinitions of \chapter and \section? -------------------------------------------------- Subscriptions, Archive, and List information, etc.: http://tug.org/mailman/listinfo/xetex