Hi, could you give some more details? I’ve not done extensive testing yet but it still works for me as it did before 3.9 in 3.9.
There are some featured image plugins that conflict with this right now, as they change the edit screen widget that the plugin is currently checking against. I’ve got a bit of a plan for getting rid of that dependency as time allows, but for now I’m wondering if that’s the issue you’re seeing.
The things that would be helpful for me would be a list of all other plugins you’re running OR a confirmation that an otherwise exactly equivalent setup worked on 3.8.x OR access to a site to debug it myself. Really probably the last on the list would be quickest, you could email [email protected] to move on that.
I hope we can solve this, and I appreciate the feedback!