I use tmux 1.7 and iTerm2.
When i run Vim and go to Insert mode and then press Esc key my tmux session crashes with following message:
[lost server]
%
This have to be problem with tmux, because when I run Vim wihout vimrc it happend too. Also I cleared tmux.conf file but wihout success.
How to handle with that error.
I had to downgrade tmux to version 1.6. Now this issue not occurs.