Minimized app window preview image missing in dock

Hello ihomestake,

It looks like you are missing some previews when an app is minimized on your Dock.

As this is happening across various apps, you can try some basic troubleshooting steps. Here are some resources that can help:

• Restart your Mac: Log out, sleep, wake, restart, or shut down your Mac 

• Toggle settings for your Dock in System Preferences such as it's Position of screen, or Minimize window into application icon, to see if it works. See Customize the Dock in Use the Dock on Mac.

• Test in safe mode as it can help you determine whether issues you’re experiencing are caused by software that loads as your Mac starts up. Start up your Mac in safe mode

• Create a test user to see if it is something only related to your user account: Set up users, guests, and groups on Mac

Hope this information helps.

Have a good day.