After some time of playing on my Survival server, inventory gets bugged. I can't move anything or craft; it acts as if I was Shift-clicking. I always have to exit Minecraft and launch it again. Not tested on Creative or Survival Singleplayer.
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Again I have to disagree. It's not about walking, but moving items in the inventory...
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MC-886 is about all kinds of stuck keys, check out the various duplicates of it.
Duplicate of MC-886.