As soon as I enter the world I can move my mouse and the perspective will rotate fine. After a few seconds, the I lose control and whenever I move my mouse, it follows a pattern. The best thing I can relate this to is if someone was using a command block and just rotating your head around and around.
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is duplicated by 2
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I've attached it. It turns out that this only happens when the program Synergy is active, but I don't understand why. Synergy doesn't need to be connected to anything, just as long as the service is running this occurs.
Please force a crash by pressing F3 + C for 10 seconds while in-game and attach the crash report (
[minecraft/crash-reports/crash-<DATE>-client.txt|http://hopper.minecraft.net/help/finding-minecraft-data-folder]) here.