I use the room key for charging for the reasons Carol mentioned. However, in August 2009, I had my card denied twice when purchasing something at the Meadow Trading Post. I then had to go to the checkin desk to see what happened. In both cases, I had reached the $1,000 limit and had to request that it be charged to my CC. When I mentioned that this used to be automatic, the CM stated that you now had to request that it be charged back. I don't know if this was for security purposes or not, but it resulted in having to go to the front desk every 4 or 5 days to see how much was left on the card and if needed, have it charged back to the CC.
Has anyone else experienced this? I'm hoping that was just some type of "trial" and is no longer the case.