When using my MacBook for a while (Sierra, 10.12.3) then using cmd+tab to switch applications, I sometimes lose application icons. In the screenshot below, it's limited to Chrome but multiple applications will disappear at a time.

I can get the icons back temporarily by restarting or running killall -KILL Dock but I'd like a more permanent solution.

enter image description here

  • 1
    Already tried Reset icon cache?
    – klanomath
    Mar 8 '17 at 17:01
  • I hadn't tried that but gave it a shot to no avail.
    – imjared
    Mar 10 '17 at 15:08
  • 1
    See if you can isolate it to your account vs system wide issue by attempting to recreate the issue in another user account. I suppose the guest account suffices, but the best test would be to make another "test" account with admin privileged. What results?
    – njboot
    Mar 13 '17 at 8:07
  • Possible duplicate of App icons go missing on MacBook
    – user310476
    Jan 1 '19 at 15:45

I had the same issue, and after restarting Dock, I still couldn't see the app icons popping up when I pressed cmd-tab. However, if you could see the Dock restarted after following the instructions to restart it, then the problem might be your external monitor. Unplugging the video cable to my external monitor and plugging it back in fixed it for me.

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