Computer：Mabbook Pro retina 2012 late
OS: OS X 10.9 and 10.10 all have this problem
terminal: iTerm and terminal all have this problem
vim version: Macvim 7.4.258
tmux version: stable 1.9a (bottled) HEAD
my dotfiles: .vimrc .zshrc .tmux.conf
when I open vim in terminal, everything is ok. But when I open vim in tmux, I met this problem in the following picture.look at screenshot
Once in a time the problem disappear, but after I "brew update" and "brew upgrade" It comes back. I really don't known what's wrong with them.
I can't code without tmux + vim , who can help me.
I have tried clear .tmux.conf, the problem still there. I tried to update the vim bundles, the problem still there.