Someone said :
Click Privacy & Security
Under History click the drop down and select use custom settings for history
Then check that the tick box is ticked for
x Accept cookies from websites
and the keep until setting is "they expire"
In same section click Show Cookies...
Search for gaire and then click the remove all shown button
Hopefully that should work.
This evening I noticed that if I go to the site via a link (such as from typing the site's address into Google and clicking one of the links that the search returns), then I am logged in. However, if I open the site using the 'predictor' when I start typing the address in the address bar, I need to log in.