I'm running iTerm 2 on 10.8 and I've installed zsh with oh-my-zsh and tmux (both from homebrew). When running zsh in iTerm it's all good, however, as soon as I run tmux, there is this weird distance between the margin and the cursor. What's weird is that once the command is executed, the distance disappears.
You can see it in the following screenshot.
Any idea what might be causing this? It's annoying ...