Updating from snapshot 14w08a to 14w10c, or 14w11b or 14w17a causes the following log attached to this bug report.
(Note: Multiple players are listed under IGN in the whitelist, op-list, ban-players list. )
I can conclude that the console wishes me to delete all player list text files because the new uuid system isn't able to reference the IGN's in those files properly.
If the player data folder is wiped some players have their stuff while others do not. Their location and inventories are reset.
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This is very interesting, I've misspelt his name as Donnerschlagg. His actual ign is donnershlagg who has not pirated the game and you can view his stats and uuid here: http://fishbans.com/u/Donnershlagg
Regardless Kumasasa, if I remove that entry the console will continue to ask to remove more and more player until the whole player data folder is wiped. This is no where near resolved.
Is this still a concern in the current Minecraft version? If so, please update the affected versions in order to best aid Mojang ensuring bugs are still valid in the latest releases/pre-releases. If this has been done, we can reopen the issue.
Keep in mind that the "Resolved"-Status on this ticket just means "Answered", and that we are waiting for further information on whether this issue still exists or not. We will reopen it as soon as the requested information has been delivered.
User donnerschlagg has pirated the game.