I updated the plugin today and CANNOT submit a post that has a manual excerpt.
When my post has a manual excerpt and I try to publish the post, I get sent to my 404 page (url shows wp-admin/post.php) and my changes don't get saved.
Removing the manual excerpt does not result in a 404 error and changes do get saved - everything works as normal.
This occurred immediately after updating this plugin. No other updates or changes were made to my site. I ALWAYS use manual excerpts and this never was a problem before the update.