It appears Malwarebytes Browser Guard prevents login
I was trying out the new Community, and could not get logged in. I got the panel telling me to go to my email, went there, clicked on the button to authorize login, but never got logged in. I finally tried disabling Malwarebytes and the login proceeded correctly. I think this function of Malwarebytes functions as a pop-up and/or ad blocker, so similar problems may be seen with other such extensions. The browser was Chrome.