My brother had the same problem. He just kept trying then gave up. He went on another computer, it still didn't work. I think he like shutdown the computer or something then went back in and it worked. I doubt that this is gonna work, but it worked for him just randomly.
http://www.mineverse.com/threads/player-reset-list-creative.20753/#post-200339 READ MY POST THROUGHTLY Hope I helped a little bit
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