Oops, I was too fast upgrading... luatex fails to produce format files on my system: luatex --version This is LuaTeX, Version snapshot-0.20.0-2007120515 luatools --ini --compile cont-en LuaTools | creating initialization file cont-en LuaTools | using library path : /usr/local/texlive/texmf-local/tex/ context/base LuaTools | using lua libraries: l-string.lua l-table.lua l-boolean.lua l-number.lua l-unicode.lua l-md5.lua l-os.lua l-io.lua l-file.lua l- dir.lua l-utils.lua l-tex.lua luat-lib.lua luat-inp.lua luat-tmp.lua luat-zip.lua luat-tex.lua LuaTools | using compiled initialization file cont-en.luc LuaTools | using lua initialization file cont-en.luc LuaTools | running command: luatex --ini --lua="cont-en.luc" "/usr/ local/texlive/texmf-local/tex/context/base/cont-en.tex" \dump Error in lua file loading: ?:0: attempt to call field '?' (a nil value) LuaTools | LuaTools | runtime: 0.37 seconds Taco, Hans? All best Thomas