For the first time, I'm trying to set up a Open Graph action, following your manual step by step. In the overview page, the version of the Content Plugin is reported as 4.3.0 and status is OK. The plug-in overview on the right top of the Open Graph page says that the version of the Content plug in is 4.3.3 and that the plug-in is installed but not enabled. Consequently, when I try to create an object, it says that there are no plugins enabled.
As an experiment I uninstalled the Content plugin. The status on the configuration page follows accordingly, but the status notification in the right top corner of the OG page does not.
Any ideas?