Simple bug, hopefully simple to fix. It states it all in the title. Screenshot and environment attached. I wish the best of luck to the Mojang developers, as they have created a wonderful game.
Environment
Windows 10 Home 64-Bit
Java Version 1.8.0_51 64-Bit
Processor AMD Athlon II X2 245 running at 2.90 GHz
Graphics ATI Radeon HD 4200
Ram 4 GB
Thank you for your report!
However, this issue is a Duplicate of MC-130848.
If you would like to add a vote and any extra information to the main ticket it would be appreciated.
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