For enumerations the ConTeXt writer now generates \startenumerate...\stopenumerate while in 2.13 it generated \startitemize...\stopitemize with the same input. Unfortunately, \startenumerate is not valid and an error halt ensues. The previous behavior was correct.
(There are enumerations managed by \setupenumerate, but they do not use \startenumerate.)
As a workaround I have scripted a sed pass to correct things, but I think a fix is urgently needed.