Unable to Edit Pages in Confluence Cloud Due to Connect Add-Ons

Summary

Customers are not able to edit pages in their instance. Attempts to do so results in the following errors:

Workaround

Disabling Connect add-ons will workaround this issue. To do that, navigate to Confluence Administration >> Manage Add-Ons, then expand all your User-Installed add-ons. Check whether the addon's version has a AC at the back, example:

Incident status at: http://status.atlassian.com