See here for additional information and reproducible steps in the mintty
support ticket:
https://code.google.com/p/mintty/issues/detail?id=390
I can reproduce this using cygwin 1.7.20, 1.7.19, 1.7.18, 1.7.15, and 1.7.7.
Screen does NOT hang when is is created by calling the first command
through cygwin started by cygwin.bat (commands typed through Windows
terminal 'cmd.exe' instead of mintty) and then attempting to attach
through mintty with the second command.
Workaround is to use:
'cygstart --hide screen -S name -d -m'
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