The Application icons and Tags are not showing in the Library.
This can happen after Snagit has been reset or reinstalled.
Missing Application Icon
To get the Application icons to reappear in the Library, take a capture of the application where the icon is missing. In the image below, the Console.app icon is missing. After taking a capture of the Console.app, the icon reappears.
To get tags to reappear, add the missing tag to any capture in the tray and the tag will appear in the Library. The image below shows the test tag is missing. When selecting Tag and naming the capture test, the tag now appears in the Library and displays all of the images using that tag.