Pages saved with "Save Authentication" keep your sign-in
"Save Authentication" sends Screenly your sign-in for the page exactly as your browser has it, so the page your screen shows is the one you saw.
"Save Authentication" is for pages you have to be signed in to see, like an internal dashboard. It saves your current sign-in for that site along with the page, so your screens can open it without signing in.
On some sites, the sign-in the extension saved didn't work, and the screen showed the site's sign-in page or an error instead of the page you added. Sites on an address with a port number, such as dashboard.example.com:8080, were among them. The extension now saves your sign-in for the page exactly as your browser has it.
If this affects you: Pages saved before this version keep the sign-in they were saved with. Open the page in your browser while signed in, select the Screenly icon, make sure "Save Authentication" is checked, and select "Update Asset".