The Editing button turns from green to blue when clicked but that's about it. The browser's status reveals this script was called:

”mcTabs.displayTab(‘advanced_tab’,’advanced_panel’);”

I can get to the Dashboard, but only the full dashboard; the short menu that normally appears when hovering is gone.

My workaround is to logout/login, which reveals the page is awaiting approval, and the edits have been automatically published. The entire versioning aspect for the page also seems gone -- every version appears to be the latest? -- but that may another issue or me not understanding how to retrieve previous page versions.