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I noticed that some app icons changing sometimes with same blank like icon. Right now Sublime Text icon changed. Couple days ago it was happened on Safari. How can I prevent this? What will can cause this?

Sublime Text dock icon changed

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Your best bet is to reset and restart the Dock. Note you will need to re-add any non-default icons (i.e. apps) that you've added to the Dock - so you may want to take a screenshot of your Dock as a reminder of what you had there. (Or start afresh and only add things as you actually use them).

To reset and restart the Dock, follow these steps:

  • Go to Finder
  • Press and hold the option key down
  • Now go to the Go menu
  • Select the Library option to open the User's Library folder. You can let go of the option key now.
  • Go to the Preferences folder (i.e. within the Library folder)
  • Find and move the com.apple.dock.plist file to the Trash
  • Now open Terminal (usually located in Applications > Utilities)
  • Enter this command killall -KILL Dock
  • Press enter

This should resolve the issue. As mentioned previously, you will need to re-add non-default apps back to the Dock.

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