Hi everyone, This minimal example causes my luatex process to spin consuming 100 percent cpu (latest minimals, freebsd 9): \setupbackend[export=yes] \starttext hello world \stoptext To rule out any issue with FreeBSD 9, which is fairly recent, I compiled my own luatex binary from the svn trunk but still experienced the problem. Adding \startparagraph and \stopparagraph also produced the same result, but with slightly different output after interrupting the compilation process. I've read this list for years but rarely post and would like to thank everyone who contributes to this amazing project. Thanks for any suggestions, Matt mtx-context | current version: 2012.01.25 14:16 [/usr/home/mclaus/wk/git/personal/tex] context hello.tex mtx-context | run 1: luatex --fmt="/usr/home/mclaus/context/tex/texmf-cache/luatex-cache/context/2448223e6631addb83df348d74153606/formats/cont-en" --lua="/usr/home/mclaus/context/tex/texmf-cache/luatex-cache/context/2448223e6631addb83df348d74153606/formats/cont-en.lui" --backend="pdf" "./hello.tex" \stoptext This is LuaTeX, Version beta-0.70.1-2011051912 (rev 4277) \write18 enabled. (hello.tex ConTeXt ver: 2012.01.25 14:16 MKIV fmt: 2012.1.26 int: english/english system > cont-new.mkiv loaded (/usr/home/mclaus/context/tex/texmf-context/tex/context/base/cont-new.mkiv system > beware: some patches loaded from cont-new.mkiv ) system > hello.top loaded (hello.top) fonts > latin modern fonts are not preloaded languages > language en is active backend > export > enabling export to xml {/usr/home/mclaus/context/tex/texmf-context/fonts/map/pdftex/context/mkiv-base.map} fonts > preloading latin modern fonts (second stage) fonts > typescripts > unknown: library 'loc' {/usr/home/mclaus/context/tex/texmf/fonts/map/dvips/lm/lm-math.map}{/usr/home/mclaus/context/tex/texmf/fonts/map/dvips/lm/lm-rm.map} fonts > fallback modern rm 12pt is loaded backend > xmp > using file '/usr/home/mclaus/context/tex/texmf-context/tex/context/base/lpdf-pdx.xml' pages > flushing realpage 1, userpage 1, subpage 1 ^C! Interruption. system > tex > error on line 1 in file hello.tex: Interruption ... 1 >> 2 \setu pba[/usr/home/mclaus/wk/git/personal/tex] ckend[export=yes] 3 4 \starttext 5 hello world 6 \stoptext 7 8 <inserted text> \dostoptagged \finalizeautostructurelevels \global \everytop... \dostoptext ...youtpage \page \the \everystoptext \global \everystoptext \em... l.1 \dostoptext \ctxcommand ...\directlua \zerocount {commands.#1} l.6 \stoptext ? ! Emergency stop. system > tex > error on line 1 in file hello.tex: Emergency stop ... 1 >> 2 \setupbackend[export=yes] 3 4 \starttext 5 hello world 6 \stoptext 7 8 <inserted text> \dostoptagged \finalizeautostructurelevels \global \everytop... \dostoptext ...youtpage \page \the \everystoptext \global \everystoptext \em... l.1 \dostoptext \ctxcommand ...\directlua \zerocount {commands.#1} l.6 \stoptext ! ==> Fatal error occurred, no output PDF file produced!