I just tried running ctxtools --updatecontext on my minimal installation. It successfully downloads & extracts cont-tmf.zip, mktexlsr remakes all formats, then LuaTools and MtxRun start doing some configuration magic: LuaTools | old script C:/Users/chesky/Programs/context/tex/texmf-mswin/bin/luatools.lua LuaTools | new script C:/Users/chesky/Programs/context/tex/texmf-local/scripts/context/lua/luatools.lua LuaTools | old script content replaced by new content LuaTools | LuaTools | runtime: 1.627 seconds MtxRun | old script C:/Users/chesky/Programs/context/tex/texmf-mswin/bin/mtxrun.lua MtxRun | new script C:/Users/chesky/Programs/context/tex/texmf-local/scripts/context/lua/mtxrun.lua MtxRun | old script content replaced by new content LuaTools | loading C:/Users/chesky/Programs/context/tex/texmf-local/web2c/texmf.cnf LuaTools | loading C:/Users/chesky/Programs/context/tex/texmf/web2c/texmf.cnf LuaTools | preparing configuration in C:/Users/chesky/AppData/Local/Temp/luatex-cache/context/b208f38697f78de9cef2c42fc3caa621/trees/d885c87af9510561ed13a9578d2d9af5.tma ... (a few hundred more lines, until finally) (C:/Users/chesky/Programs/context/tex/texmf-local/tex/context/base/enco-mis.tex) (C:/Users/chesky/Programs/context/tex/texmf-local/tex/context/base/enco-ini.mkiv encoding : coding 032 is loaded (C:/Users/chesky/Programs/context/tex/texmf-local/tex/context/base/enco-032.tex) encoding : unknown coding 033 encoding : coding 037 is loaded (C:/Users/chesky/Programs/context/tex/texmf-local/tex/context/base/enco-037.tex))) (C:/Users/chesky/Programs/context/tex/texmf-local/tex/context/base/filt-ini.tex loading : Context Filter Macros (ini) ) (C:/Users/chesky/Programs/context/tex/texmf-local/tex/context/base/hand-ini.tex loading : Context Handling Macros (ini) handling : font handling def is loaded (C:/Users/chesky/Programs/context/tex/texmf-local/tex/context/base/hand-def.tex)) (C:/Users/chesky/Programs/context/tex/texmf-local/tex/context/base/regi-syn.tex loading : Context Regime Macros (synonyms) ) (C:/Users/chesky/Programs/context/tex/texmf-local/tex/context/base/lang-ini.tex loading : Context Language Macros / Initialization (C:/Users/chesky/Programs/context/tex/texmf-local/tex/context/base/lang-ini.mkiv ! LuaTeX error ...ontext/tex/texmf-local/tex/context/base/lang-ini.lua:9: attempt to index global 'lang' (a nil value). \ctxluabytecode ...ode " .. "#1" .. str) end end } \registerctxluafile ...{\the \luabytecodecounter } \fi \fi l.16 \registerctxluafile{lang-ini}{1.001} ? Evidently something's gone wrong, and I have no idea what. I hope this is enough info to diagnose the problem. --Joel