I would bet you just updated to WP 4.8?
The plugin seems to be not under active development anymore, and 4.8 changed the Widgets, which the PI can’t handle.
You could try a rollback to 4.7.x to get it to work again.
Sorry 🙁
@b_machuel: I had the same problems with widget Title and Content after the Update to 4.8 (did a rollback).
Do you know if there is a thread in here somewhere, or a solution, a workaround?
Works fine for me on three installations. But 4.8 breaks.
