I recently updated the screen package in Cygwin to version 4.5.0-1. This version turns out to have at least one security problem [1], and maybe other serious bugs too. So I've asked for it to be removed from the Cygwin archives.
If you've installed screen 4.5.0-1, you should downgrade to the previous release, 4.4.0-1. A new release that fixes the problems in 4.5.0 is expected out next month. Andrew [1] http://lists.gnu.org/archive/html/screen-devel/2017-01/msg00025.html -- Problem reports: http://cygwin.com/problems.html FAQ: http://cygwin.com/faq/ Documentation: http://cygwin.com/docs.html Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple