Okay all bloggers! If any of y'all are having problems leaving comments, getting a message that says YOU ARE UNATHORIZED TO LEAVE COMMENTS UNDER THIS LOG-IN, then try this:
LOG OUT, then before you log in again, UNcheck the little box that says 'Keep me signed in' !
That worked for me! AFTER 4 days of getting so pissed off that I was about to delete my blogger account! ;)