Turning On Accessibility Access In TextExpander for Mac

For privacy reasons, OS X does not allow third-party applications (such as TextExpander) to log keystrokes unless access for assistive devices is turned on.

In macOS 13 (Ventura):

Go to Privacy & Security -> Accessibility, make sure that TextExpander is on the list and the switch next to it is blue to indicate that it is enabled. 

In macOS 11.0 (Big Sur):

1. Go to System Preferences -> Security & Privacy -> Privacy -> Accessibility -> TextExpander.
2. Make sure there is a check next to TextExpander. You may have to click on the lock in the lower left-hand corner and enter in your Admin password first.
3. Close System Preferences.
4. Launch TextExpander.

In earlier OS versions:

1. Choose System Preferences… from the  menu
2. Choose Security & Privacy from the View menu of System Preferences
3. If locked, click the lock icon at the bottom left and enter your admin password
4. Click Accessibility in the list on the left
5. Check both TextExpander and TextExpander Helper in the list on the right
6. Close System Preferences
7. Launch TextExpander