HondoFrank wrote:
All my apps work in my MacBook Pro except contacts. It opens with a ghost-looking window. I ran utilities first aid no results. In researching similar questions, I found an answer to hold down Command R to reinstall OSx, but those commands do not work with Big Sur 11.5.2.
Hmmm.
There is no standalone Contacts.app, reinstalling the macOS on top of your existing macOS is the go to way to refresh the app. Internet Recovery ( Option Command R ): https://support.apple.com/en-us/HT204904
You can trouble shoot further you can:
—Try a SafeBoot https://support.apple.com/en-us/HT201262
Takes noticeable longer to get to the login screen, does a 5 minute disk repair before it fully boots up, and certain system caches get cleared and rebuilt, including dynamic loader cache, etc.
Login and test. Reboot as normal. Caches get rebuilt automatically.
In Safe mode third party system modifications and system accelerations are disabled, it removes malware, etc hampering smooth operation, however a reboot will put it back to normal mode.
This test will tell you if third party interference; extensions etc are not loaded in safe boot mode.
—Test issue in another user (or guest user) account https://support.apple.com/guide/mac-help/set-up-other-users-on-your-mac-mtusr001/mac
This will tell you if it a universal issue or isolated to your user/admin account.
Uninstall all third party apps that are Cleaners/Optimizers/VPN/Anti-Virus these are known to cause issues on the macOS.