Just received the following email which might explain why I haven't been able to login with my username for a while...
I wanted to make you aware that our website experienced a system error that may have overridden your User Name with your Hyatt Gold Passport™ account number when you recently made a reservation online. You can continue to log in to your Hyatt Gold Passport account with your Hyatt Gold Passport number and password. However, if you would like to create a new User Name, please visit goldpassport.com, log in using your Hyatt Gold Passport number and password and update your profile. If you have any questions, please contact Hyatt Gold Passport Customer Service at 1-800-228-3360.
We sincerely apologize for the inconvenience.
Warmest regards,
Jeff Zidell
Vice President
Hyatt Gold Passport