So, I have been using Edit Flow prior to WordPress 3.6 and after 3.6 was released. The more I use it after 3.6, the more I see how much of it is broken. For example, look at this support thread.

http://wordpress.org/support/topic/edit-flow-broken-in-parts-in-wp-36?replies=1

The plugin is being developed by someone in Automattic but there is no word on updates or when we can expect to see any fixes, if ever.

@Selena MacIntosh - Have you upgraded to WordPress 3.6 and are still using Edit Flow? Curious to hear how many bugs or broken things you have run into.