If you use a hard-to-find patched powerline font such as Monaco like I do, the patch above will help you by reverting the latest glyph moves.
Use it like this:
$ cd .oh-my-zsh/themes
$ patch -p2 < unbreak_powerline.patch
Restart Terminal, iterm2, or whatever you use, and your powerline font should be working again.
I'm getting this error
bash: unbreak_powerline.patch: No such file or directory