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Whenever i try to load a world i get this error http://pastebin.com/W6j0YNhz It used to not happen until a few days ago
Any help is greatly appreciated.
You need to update your Optifine to one of the 'C' versions. (At this time, I don't know the correct version to be using)
Also, have you tried using Java JRE 6 instead of the JDK?