Tip for World of Warcraft addons users: How to reset your WTF and Interface folders without deleting them. You'll do this when a new patch comes out and your addons get all messed up and you want to reset them all. You'll also do this if your UI is so messed up that you can't play properly.
Do this before considering calling Blizzard support for your game at all. It's the first thing they'll recommend you do anyway.
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