After I downloaded some custom dictionaries, copy-paste them into ~/Library/Dictionaries folder, and reordered them in Dictionary app's Preferences, some options in the Preferences cannot be selected anymore (the check-sign cannot be selected, it blinks). How to solve this problem?

  • 1
    Sounds like one of the dictionaries is causing problems. Try removing all the ones you've added and then install them one at a time, checking the options.
    – benwiggy
    Commented Jan 22, 2020 at 7:35
  • @benwiggy: I'm trying reinstalling the macOS to solve this problem... I don't know where to download those built-in dictionaries.
    – Raining
    Commented Jan 22, 2020 at 7:37
  • Just remove those you‘ve installed manually, reboot and see whether this helps. Reinstalling the OS for this seems to be a rather extreme measure.
    – nohillside
    Commented Jan 22, 2020 at 7:39
  • @nohillside: Actually I only added and deleted those custom dictionaries and no touch anything else, and I did try reboot, but the problem remains. I also thought reinstalling the OS a bad idea, but I cannot find the solution for this problem... Anyway, thanks for your comment.
    – Raining
    Commented Jan 22, 2020 at 7:46

1 Answer 1


This is a bug specific to MacBook Pro 16-inch with Catalina 10.15.X (In my case X=2), so reinstall the OS will not help. If you're in the same situation, I can solve this problem for you as follows, which is my conclusion from the Apple Communities thread discussing the same problem:

  1. Remove all folders under /System/Library/AssetsV2/PreinstalledAssetsV2/InstallWithOs/com_apple_MobileAsset_DictionaryServices_dictionaryOSX.
  2. Restart your computer. (In my case the Look Up didn't show some dictionary definition before I restarted my computer.)

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