Hello Hans,

\registerhyphenationexception as described in latest languages-mkiv.pdf and
i-context.pdf does nothing, contrary to \startexceptions, which behaves as
expected. Here is the minimal example:

\mainlanguage[cs]
\showmakeup[discretionary]
\registerhyphenationexception[cs][cíl-em]%
% \startexceptions[cs]
% cíl-em
% \stopexceptions
\startTEXpage
cílem
\stopTEXpage

By the way, what is the reason to print \showlayout on four pages?

Regards,
Jano