Hi
I think that something happened to zsystem / flock, as the following
returns the above error under Cygwin:

$ zsystem flock -t 0 -f FD -e /home/SG/.zsh_nr1
zsystem:34: flock: invalid timeout value: '0'

Timeout of value 0 is an acceptable one - it means no waiting for the lock,
just try-to-lock and exit.

-- 
Sebastian Gniazdowski
IRC: https://kiwiirc.com/client/chat.freenode.net:+6697/#zinit
Blog: http://zdharma.org