- Bring up the Avatar Editor overlay
- Delete your locally stored avatar and click Okay on the overlay
- Your locally stored avatar is now deleted
- Go back to the Avatar Editor overlay and check the Use Gravatar radio box and click Okay on the overlay
- No Gravatar is applied
- Refresh the current page you're viewing and go back to the Avatar Editor overlay and repeat step four
- The Gravatar will be applied
Obviously make sure you have an avatar stored on Gravatar when doing this.