Hi, sorry to hear your Post Loop widget is outputting as expected. If you’ve rolled back to 2.10.11 there weren’t any changes made to the Post Loop widget in that release. You can view the changelog on GitHub.
If you’d like us to take a look, please, open a new support topic. The form is at the bottom of this page. Please, include a link to the page concerned. Please, also take screenshots of the Post Loop widget’s settings including the query builder and upload to imgur.com or a sharing site of your choice and send the link. Thanks.