AME won't sign me in to Youtube

I'm trying to sign in the Youtube through AME. It goes through all the motions ok, I click "Allow" to give AME access to my account, the page flashes like it's refreshing, but I'm not signed in. It still says "Log In". I rarely upload through AME but I have done it before and it worked fine, before, say the magic woids and win a prize, the latest update!!!

Anybody else? Grrrr....