I just upgraded Edit Flow to Version 0.3.2.
In the Settings page I got this message in a red box:
Note: Custom Statuses are currently disabled
While you are free to add, edit and delete to your heart's content, please note that you will not be able to assign posts to custom statuses unless you enable them.
I the site's admin so I should have the right. I think it is a bug in the new version.