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The plane object have the bubble text as texture.
The texture have alpha channel, but in the 3d view and the render is generate lines of white color, I don't know why. I wait that you can help me. Thx.
In the Textures tab scroll down to Image Mapping and change Extension to Clip.
The texture is repeating the top and bottom edge pixels. Set the texture's Extension to 'clip' to fix the issue.
Required, but never shown