Open the launcher program, run the game, hit singleplayer then select world, get to Loading World Building Terrains then game crashes and brings back to launcher. Ran log and got: Keeping entity minecraft:pig that already exists with UUID d526d885-4e9f-4d19-8866-d4ef197bdfc2 in the debug message. Attempted to fix issue in MCedit but unable to run the plugin that fixes said issue.
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Please attach the crashlog from [minecraft/crash-reports/crash-<DATE>-client.txt|http://hopper.minecraft.net/help/guides/finding-minecraft-data-folder/]
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Crash file was attached, I apologize, did not see that there were crash reports, would have attached it otherwise.