Never had them before and now I did. I logged in, clicked the "mark as read" button on a notification and got a notice asking me to login first. So I tried to follow the notification instead and got booted to the login page with the notice "You need to login to perform this action". Once there, I tried to login about 4 or 5 times, only to stay on this login form (probably because the target url was the redirect of a notification?). I went back to the board index, tried to login again, got booted out immediately again once or twice. Then I made it to this quick reply form. Gonna log back in again to post this.
Firefox Nightly 73.a1
Ideas are useless if you can't make them real.