Hi Hans, the plain format from context calls a non-existing function fonts.goodies.filenames.resolve(). It appears that the format was not updated to include the expected code from fonts-gds.lua. [1] Terminal output below. Regard Philipp [1] The code was introduced to font-def.lua on November 16: http://repo.or.cz/w/context.git/commitdiff/4f08d2072378de7bac2c7992876b8f701... $ luatex -fmt luatex-plain.fmt This is LuaTeX, Version beta-0.70.1-2011051923 (rev 4277) \write18 enabled. **\relax (./luatex-basics.tex) (./luatex-fonts.tex <push namespace> <./luatex-fonts-merg ed.lua>(using cache: /home/laokoon/context/tex/texmf-cache/luatex-cache/generic ) ! LuaTeX error ./luatex-fonts-merged.lua:12701: attempt to index local 'fontgoo dies' (a nil value) stack traceback: ./luatex-fonts-merged.lua:12701: in main chunk [C]: in function 'dofile' ./luatex-fonts.lua:107: in function 'loadmodule' ./luatex-fonts.lua:111: in main chunk [C]: in function 'dofile' <\directlua >:1: in main chunk. l.136 } ? ! Emergency stop. l.136 } ! ==> Fatal error occurred, no output PDF file produced! Transcript written on luatex-basics.log.