Earlier today I reported on the Ed's 'back button' thread that mine wasn't working again. The'Rrecent Pages' drop-down menu is currently showing 1 advert, but has been showing up to 3.
Maybe the Ed cleared HIS cache, and now it is filling up again?
PS It is now showing 2.
I think the longer you stay on a page, the more adverts appear in the back-button list.