My colleague had the same thing happen to her at the Marriott Bay Point Resort in Panama City Beach, FL. She said she got to her room and opened the door... to an empty room. She was a little surprised, needless to say. She called the front desk (there was a desk and phone in the room) who promptly moved her to another room. She never did find out why the room was devoid of beds yet had been assigned to her. And she stays there just about every other week for a week at a time...