Hello Wolfgang, this was atricky one to track down: If in my first line after \startletter I’ve a comment containing another \startletter, I get: \stoptext ! File ended while scanning use of \buff_gobble. system > tex > error on line 0 in file : File ended while scanning use of \buff_gobble ... <empty file> <inserted text> \par Minimal failing example: \usemodule[letter] \starttext \startletter[subject={context}] %\startletter \input dawkins \stopletter \stoptext Greetlings, Hraban --- http://www.fiee.net/texnique/ http://wiki.contextgarden.net https://www.cacert.org (I'm an assurer)