Coolguy6099

I am having a problem. I am on a MacBook Pro and running Java 1.6.0_51 (which is the built in version of Java for my Mac) and every time i launch the game, it passes the Mojang screen, but when i try to connect to a server, or create a world, the screen goes white and eventually disappears. I have tested this on my brother's Mac, and they have the same outcome. I also tested this on a windows laptop, and it works like it is supposed to. (Connecting to servers, generating a world, etc.) Any help would be greatly appreciated :)