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 why wont minecraft work?
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Replying to @CRAZYPONY11
@CRAZYPONY11 What happens when you try to play? ^LK

Feb 8, 2015 · 4:11 PM UTC

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Replying to @MojangSupport
@MojangSupport i cant play it just crashes