Do you by any chance have a second address set up on your CC file?
That screwed me up a year ago when I wanted to sign up for PM. I did not remember that I added my work address to my Visa, because some online sites won't process transaction if you want to ship somewhere else if you only have your home address on file with CC.
Little did I know, adding the work address to my Visa made it the primary address, and the PM system could not process the transaction, even though my home address (which I was entering) was still on CC file.
Of course the PM system would not give a proper hint as to what may be wrong, just a generic message that it cannot be processed. Calling Visa a few times finally revealed the problem, but even after asking Visa to remove the work address completely and put my home address as primary, it would not process. I actually entered my work address, and boom it processed. My CC was expiring anyway, so before the next refill I changed the number and address and everything has been OK since.
Or, did you happen to move and changed the address on the CC recently?
