This was definitely account related, since I changed nothing on my browser and all the various logins work as expected again after 2+ weeks of problems. My flight-pass accounting issue was also magically fixed.

While I am gratified to have regained the privilege to be able to give AC my money electronically again, my confidence in this issue being permanently fixed is pretty low given the opaque manner in which AC handled this major IT snafu and resulting preferred customer inconvenience!

I fully agree with Blue2002 that some form of compensation to those affected is in order. :-: