I found out that Rise auto updates the Rise Player Software and Chrome but they do not include Java so if you have a display showing a red heart but it works just fine. Run a Java update on that display and reboot it. Refresh your display tab in your Rise Account and your display should then turn to a green heart. You might ask why did it happen now? My guess is that the latest Chrome and Rise versions didn't play well with the outdated version of Java and that's why it happened out of the blue. I hope that helps!