Not sure if this is the best place to ask this but does anyone know why I'm seeing those purple-ish bars in my vim?
My vimrc http://dpaste.com/698999/
Also, I'm using Lion OSX
I would try different color schemes, e.g.
I found that some color schemes have this problem with some terminals. Perhaps the scheme wants 256 color support and your terminal isn't capable.
I'm not sure why this happens but I experience it on vim in xterm with the solarized colour scheme. To fix it, I suspend vim (ctrl-z), reset the terminal (the reset command) and resume vim (fg).
So possibly the terminal has entered a weird state not anticipated by vim.
This happens more when editing LaTeX than when editing C++ or bash scripts. It seems to be tied to certain keystrokes.