We picked up a Westin room on Housing Portal day and got it canceled out too, despite it being a pay in full one. We ended up going with Marriott, and then stalking the housing portal until we got a much more reasonably priced room, but we were very lucky in that.
I'm glad to hear you got a room. Did you talk to anyone at the hotel when it was cancelled? I talked to several people including the general manager and everyone was extremely dimissive of me. It was very frustrating.