Some of my icons have disapeared

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http://ubuntuforums.org – Ubuntu 12.04 Precise Pangolin Updated 64 bit Everything was working fine, and then I installed MyUnity and now I have two icons(Home Folder and System Settings) missing from my launcher, and my trashcan icon is missing. They are just blank boxes. In addition to this, ALL of my original icons are just blank-white, but my own-custom-drawn icons are still there. How can I fix this? (Hardware)