I don't stay logged in

[MojaveGeek]

OK, this is happening to me now. Perhaps related to having to re-launch my browser after a power failure?

I'm not recognized when I open the site. I have to log in again. I have clicked "remember me".
When I enter my name and PW I see an error message:

Death Valley
Authorization code mismatch. Are you accessing this function correctly? Please go back and try again

But when I then go to the forum, I am recognized correctly. Until I log out.

Chrome, Win 7.