If you change your Minecraft username, you should fully log out of the game and then back in before playing again.
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@MojangSupport Yeah thanks .... but yesterday i bought a OF cape , and today after the change my name to Jicuu , my cape dissapear. :(
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Replying to @KazeVF
@McBoobix I am afraid you would have to contact Optifine about that. ^OZ

Feb 4, 2015 · 11:29 AM UTC

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Replying to @MojangSupport
@MojangSupport I solve that. It's a bit difficult but i'm ok now xD !