Hi, I no longer have any of these problems with Adblock. Somehow, somewhere, Adblock has completely disappeared. There is no icon in the security centre so I cannot reactivate it. There is no clue in any of Avast's literature as to this removal or whether some thing has gone severely wrong. It has happened on two computers I use at home but on another computer, Adblock still functions. Anyone else having this problem and anyone else got any solution? Thanks