When using the summon command and spawning a slime the size bigger of 100 (egs. /summon Slime ~ ~ ~ {Size:200} ) a giant bugged out slime will spawn. You can't interact with it and switching the Difficulty to Peacefull won't do nothing. Re-log to fix the bug.
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qmagnet
Duplicate of MC-67608
kumasasa
Please update your Java to the latest version (1.7.0_67 / 1.8.0_20): http://www.java.com/en/download/ and report to MC-67608 if that has resolved the issue.
When using a 32-bit browser on a 64-bit operating system the automatic version detection will only show the 32-bit version of Java, the 64-bit version needs to be downloaded manually: http://www.java.com/en/download/manual.jsp.