Since I can't PM you with this screeshot Mark but look what I've got. I was logged out first and then this.
I'm pretty sure you would only get that page if you click the Register button. Perhaps you did so accidentally after being logged out.
In regards to being logged out. It's difficult to continue the investigation when you are the only person on MW getting it and to make it worse, it only happens on your work computer. Also, the fact you got a cookie warning from CloudFlare when I upped security suggests your system at work is interfering with cookies which is precisely where login memory is stored.To all:
Are any of you getting logout issues still?