Hi, In MkIV of last beta version (2008.10.03 23:45), when I was loading certain Chinese fonts such as AdobeSongStd-Light or SimSun, LuaTeX happened to be interrupted. As the following example: \definefontfeature [zh][mode=node,script=hang,lang=zhs] \definefontsynonym [Song][name:AdobeSongStd-Light][features=zh] \definefont[myfont][Song at 12pt] \starttext \myfont 中文~English~之间的间隔\par 中文\;English\;之间的间隔 \stoptext I got such informations of error: load otf | loading: /usr/share/fonts/adobe/AdobeSongStd-Light.otf load otf | warning: Bad call to gww_iconv_open, neither arg is UCS4 (EUC-CN->UTF-8) load otf | warning: Bad call to gww_iconv_open, neither arg is UCS4 (EUC-CN->UTF-8) load otf | warning: Bad call to gww_iconv_open, neither arg is UCS4 (EUC-CN->UTF-8) load otf | warning: Bad call to gww_iconv_open, neither arg is UCS4 (EUC-CN->UTF-8) MtxRun | fatal error, message: luatex: execution interrupted Now, I can't compile any Chinese document using MkIV.