I noticed an issue with multiple glyphs but am not sure why ... (so we need very small examples to figure it out).
I have observed a phenomenon that when the base text contains glues/spaces, an error occurs, as in the following example. Coincidentally, when using \setscript[hanzi], the macro will inject glue between Chinese, and I will get the same error. %%%begin example \starttext \ruby{a a}{b} \stoptext %%%end example Best Regards, 黄复雄（Huang Fuysong） ___________________________________________________________________________________ If your question is of interest to others as well, please add an entry to the Wiki! maillist : ntg-context@ntg.nl / https://www.ntg.nl/mailman/listinfo/ntg-context webpage : https://www.pragma-ade.nl / http://context.aanhet.net archive : https://bitbucket.org/phg/context-mirror/commits/ wiki : https://contextgarden.net ___________________________________________________________________________________