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

Hard to say without knowing what's in your vimrc, but you can confirm whether it's something in there by starting it up without running it and seeing if it still happens using the following...

vim -u NONE