Hello,
Here a minimal test file, to reproduce the problem with latest MKII:
% engine=pdftex
\usemodule[letter]
\starttext
\startletter
\subject{Test}
hello
\stopletter
\stoptext
Cheers, Peter
--
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Hi Peter,
the message you get is a side effect of the buffer code for mkii,
although i have a fix for the context code it won't be applied because
unwanted side effects can't be be guaranteed.
As you should have noticed your example worked in a older release
where i used a different method to