Hi - i have had to reset my own password a few times - and it only gave me problems the first time, when i did it via the Aer Lingus website. After chatting to the AerClub desk, they advised doing the password change directly on the Avios site, as this is used for authentication purposes by the AerClub section of the Aer Lingus site. Since taking this advice, both myself and my wife have changed passwords a number of times without problems.