Follow these steps to use the Photos library repair tool:
- Hold down the Option and Command keys while you open Photos on your Mac.
- In the dialog that appears, click Repair to start the repair process.
You might be asked to type in your user account password to authorize the library repair.
Dec 12, 2016 The User Library folder is hidden by default in MacOS Catalina, MacOS Mojave, macOS High Sierra, and macOS Sierra, but some advanced users may wish to show and access the /Library/ folder, which contains preference files, caches, and application support data. After I upgraded my iMac to macOS Sierra from El Capitan, I've lost all my email folders under 'On My Mac'. On My Mac Mailbox folders missing 32077 Views 2 Replies. Latest reply on Nov 18, 2016 1:54 AM by andrekolmeijer. Tried that, but importing didn't work for me and even when I found the right folder (V4) to put them in they still.
The repair tool analyzes the the library's database and repairs any inconsistencies it detects. Depending on the size of your library, this might take some time. When the process is completed, Photos opens the library.
If you repair a library that's automatically updated with iCloud Photos, the entire contents of the library re-updates with iCloud after the repair process completes.
Font Book User Guide
You can restore the fonts that were originally included with your Mac. This may be useful if you’re having issues with Font Book. Restoring the standard fonts moves any fonts you’ve installed into a separate folder, which makes them unavailable to use in apps.
Sierra Library Software
In the Font Book app on your Mac, choose File > Restore Standard Fonts.
Any fonts you’ve installed are placed in /Library/Fonts (Removed) or in ~/Library/Fonts (Removed). To install those fonts again, just reinstall them.