Anyone else noticing a new Widget backend in WordPress. As of May 9, 2018 the screen shown above has started to load before switching back to the familiar Widget backend.
Is WordPress rolling out a new Widget backend? Only time will tell however I was able to click the edit button on the new interface which took me to a brand new option page, showing Placement locations among other features.
This error seems to be tied into the Widgets. The weird part if the WordPress Events and News section has been hidden on this site and now is showing?