Since installing 3.5RC and even upgrading to 3.5 my login state for sites hasn't been respected by FF. I have to log back into every site I visit every time I r

Since installing 3.5RC and even upgrading to 3.5 my login state for sites hasn't been respected by FF. I have to log back into every site I visit every time I restart firefox - anyone have any suggestions as to what I can try to fix this? Cookies are on, passwords are stored and I'm not in privacy mode.