While moving the cursor across a vim process open in a tmux session, every now and then, why does it leave a trail of ghost characters - ^[OB, ^[OA?

Question

These disappear if I do a page-up and page-down. Why does this happen and how do I rectify it?

http://i.stack.imgur.com/DnMYl.png

I recently fiddled around with

Answer 1

Do you happen to be using zsh? I had this issue with vim + zsh/oh-my-zsh. Moving back to vanilla bash solved this issue (amongst others) that I was having with vim.