Steps to reproduce:

1. Open frontend section which content is build using screens. E.g., Monitoring -> Discovery, Monitoring -> Problems or Monitoring -> Screens
2. Sign out in parallel tab and move back to first tab.
3. Wait until page content is refreshed. You will see strange layout with 2 warning blocks before and after filter, telling that you are not logged in.
4. Press login button at error message block. You will be redirected to login page.
5. Type in valid username and password.

Result:
User is redirected to jsrpc.php page and see unrendered HTML code in browser.