i have a similar situation—-I cancelled 2 reservations last week, one using points and the other using my AMEX free night certificate. I received an email confirm for the points cancellation and a return of my points but no email nor my certificate back for the other reservation. I can see both cancellations in my account but I am still missing my free night certificate and now with the category changes on the 5th, I’ll be screwed out of making my reservation at my preferred hotel. Called customer service last week but they still haven’t been much help. Anyone else encountered the same issue or has Marriott “stolen” my certificate??