I have recently received a new credit card and the one that Angelfire have is no longer in use. All attempts to enter the new card details in my account fail.

I check 'New credit card' and enter the relevant details and hit 'confirm'.

Nothing changes in my account details and only the old original (defunct) card remains listed so I can't 'switch payments' or redirect payments to my new card.

I am able to change other details, eg address, etc. 

I have cookies enabled.  Is there something else that is not obvious that must be done to get card details entered?