please check validity of various links sent to users via e-mail. I received the links today in an e-mail notification about becoming a new rank Level 1. (The sender is visible as firstname.lastname@example.org.) The links appear invalid to me. I see this error message in a red box: "The page you are trying to access was not found. Please check your URL for typos and try again." And interestingly, although I am signed in another window, after clicking on the link, the page shows me unsigned. After signing in again, the link changes to error404page for all of the 4 invalid links while the red box with the same error message remains.