We've installed the latest 7.1 hot fix and are experiencing a bug with the new 'like' pop-up window.
If there are more than 10 the names they show up outside of the box. Also, and more importantly, you need to click the close button four times to get rid of it. Each time you click it the screen gets a little bit brighter. On the fourth click the box goes away. I have tested with multiple browsers.