utada hikaru posted another message. she was talking about her performance of "Kiss & Cry" and that she was upset that she didn't perform it well and that it is the only time she was going to be able to perform it live. also. she stated that during the performance her "switch" for her voice didn't come on and that's why she sang the song poorly. thus that is why she was upset at the end. it was really one of those days where the voice won't cooperate with it's master. so now this issue has been resolved :)