No more displaying in post editor

Hello,

Plugin used to work fine until today as I can’t see anything anymore in post editor.

I have the setting “Display widget with articles from around the web in your “Compose-new-post” page” enabled and always worked fine but now nothing shows up anymore.

Any known issues with latest WP updates?

https://wordpress.org/plugins/wordpress-23-related-posts-plugin/