@TED ah hah! it is the tracking cookie. same deal with your signature. you got to recheck the log in box after every time you have cleared history. this is so the website can install the tracking cookie to remember you by. log in once check off then again check on to re-install it..
my AV's remove all cookies is why it came back even though the box was checked. try it bet it solves the issue for you to.
i set it now to keep that cookie so we will see if that issue disappears. if not your welcome to my forum and you can mod there to if need be..