I keep getting the following, even after reloading it reappears after 3-5 seconds
The Paperpile Chrome extension was updated or restarted. This page needs to be reloaded
It sounds like the extension is failing to reload properly. Try manually restarting the extension: Go to more tools --> Extensions, in the Chrome menu. The switch the Paperpile extension off, then on again, then reload your Paperpile tab.