ActionTiles login sessions are currently "very" long lasting (similar to how Gmail doesn't require you to login each time you open your browser...).
If you keep being asked to login, perhaps you have disabled cookies, set "clear cookies on exit" or are using a private / incognito browser window.
Be sure to always Logout if you login on a shared PC or insecure device. If you forgot to logout, use "Forgot Password" or "Change Password" as soon as possible. This will terminate all logged in sessions of your Account as a useful side-effect.
Customer support service by UserEcho