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It appears that the newotf mechanism does not handle .ttc fonts. The following MWE uses fonts found on Windows 8.1: \usemodule [newotf] %% the following fonts, all .ttc, fail in the same way: % C:/ConTeXt/tex/texmf-context/tex/context/base/font-oup.lua:651: bad argument #1 to '(for generator)' (table expected, got nil) %\definefont [testfont] [MSMincho sa 1] %\definefont [testfont] [MingLiU sa 1] %\definefont [testfont] [Gulim sa 1] %\definefont [testfont] [Batang sa 1] %\definefont [testfont] [msyh sa 1] % Microsoft YaHei %\definefont [testfont] [msjh sa 1] % Microsoft JhengHei %\definefont [testfont] [SimSun sa 1] %% the following, none .ttc, work: %\definefont [testfont] [arialuni sa 1] % Arial Unicode MS %\definefont [testfont] [yugothic sa 1] % Yu Gothic %\definefont [testfont] [yumin sa 1] % Yu Mincho %\definefont [testfont] [kaiu sa 1] % DFKai-SB Regular %\definefont [testfont] [simfang sa 1] % FangSong Regular %\definefont [testfont] [simhei sa 1] % SimHei Regular \definefont [testfont] [simkai sa 1] % KaTi Regular \starttext Confucius’ {\em Analects} ({\testfont 論語} {\em LunYu}). \stoptext Without the new module, this works with all of the test fonts. -- Rik