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Fix Incorrect Mac Dock Icon Badge Count

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Fairly often, my Mac OS X 10.8 Mountain Lion “Messages” app shows the wrong number of unread messages.

Sometimes I can make the badge update after double-clicking every contact in my buddy list. With a big list, that is not a practical solution.

Instead, I’ve found that these steps seem to work:

  1. Quit the problem app
  2. Open Applications/Utilities/Terminal and run the following command:
    killall Dock
  3. Launch the problem app
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