I recommend using Prezto[1][2] or not using a framework at all.
Prezto is an almost complete rewrite of OMZ that is simpler, completely modular and has a huge amount of bugs fixed.
Not using a framework avoids bloat and unexpected settings and can be quite pleasant using tools like [3].
[1]https://github.com/robbyrussell/oh-my-zsh/issues/377
[2]https://github.com/sorin-ionescu/prezto
[3]https://github.com/ingydotnet/...