Hi all, I had not made use of the tikz module for some time, and today I needed it; but inserting "\usemodule[tikz]" in my preamble has this effect: ........................................ system : module tikz loaded (/usr/local/tl/2007/texmf-dist/tex/context/pgf/frontendlayer/t-tikz.tex (/usr/local/tl/2007/texmf-dist/tex/latex/xkeyval/xkeyval.tex 2006/11/18 v2.5f key=value parser (HA) (/usr/local/tl/2007/texmf-dist/tex/latex/xkeyval/xkvtxhdr.tex 2005/02/22 v1.1 xkeyval TeX header (HA)) (/usr/local/tl/2007/texmf-dist/tex/latex/xkeyval/keyval.tex)) (/usr/local/tl/2007/texmf-dist/tex/context/pgf/basiclayer/t-pgf.tex (/usr/local/tl/2007/texmf-dist/tex/context/pgf/basiclayer/t-pgfcor.tex (/usr/local/tl/2007/texmf-dist/tex/context/pgf/systemlayer/t-pgfsys.tex (/usr/local/tl/2007/texmf-dist/tex/context/pgf/utilities/t-pgfrcs.tex (/usr/local/tl/2007/texmf-dist/tex/context/pgf/utilities/t-pgfmod.tex) (/usr/local/tl/2007/texmf-dist/tex/generic/pgf/utilities/pgfutil-common.tex) (/usr/local/tl/2007/texmf-dist/tex/generic/pgf/utilities/pgfutil-context.def (./desvaleur.aux ! Undefined control sequence. l.1 \citation {*} ? ........................................ either on pdftex or xetex! last context update 28/01/2008 Any ideas? TIA -- Jean