Thanks, I also had this issue pop up in March with a 4 night award stay that I changed to a 5 night (got the fifth night free), and then they took the point and said I would owe $2500 at check in!!! A frantic call to the hotel, and they said "don't worry, it is just a glitch, we will take care of it"...... and they did. Seems this glitch has been going on for a while, wish they would just fix it.