If you are in a world and you tab out, tab in and fastly tab out and in again, your graphics are purple, black and white (this isn't a texture pack, probably a problem with loading graphics cause of tabbing out). This may needs some tries and also works in title screen (so it works everywhere).
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Cleaning up old tickets: This ticket has not been updated recently (~1 year+) so is being closed as Cannot Reproduce. If you feel this is still a valid issue then please comment, or create a new ticket following the Issue Guidelines.
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Owww!! This also happen in me as well.