Well its kinda weird with me. I have who knows how many email accounts, personal, "business", spam. And the business one I can not long into at all. I get the same error message. Logging out and back in is no help, like you stated.
But then, I can log into my other personal account just fine, no error message at all.
So, I don't know why it would effect one of my emails and not the other. Hopefully this will be fixed soon. I have known this to happen before and it doesn't take that long to get resolved. Especially since probably 95% of everyone I know uses yahoo for one thing or another.
