For security, Tempus uses a hidden timestamp in the code of the page. If you bookmark a page, you may also bookmark this timestamp, which will cause an error. Do not bookmark the /login page, bookmark a page once you are logged in. If Tempus recognises you are not logged in, you will be redirected to a working page with a correct token.
Tempus can remember you on one device only. If you tick the box on every device you use, it will only let you access Tempus from the last device you logged in from. If you do not tick the remember box, you may have to login again after a period of inactivity.