I have been trying to cancel a reservation for about 3 weeks. I continually get the message that I have an "invalid" credit card expiration date. I still have a month to go, so it's kind of an exercise, at this point, to see how long it takes.

I've been able to make one reservation (with a non-Hyatt chase card). The system thinks my Chase card has expired. It still has a couple of years to go.

Now, however, it won't let me make any reservations (though, on most days, the rates do show up).

All my reservations show up and my GP account seems to be accurate.