Hi there, did you update the theme via ftp? Apparently another customer reported that it couldn’t be done through the wp admin panel as the buttons weren’t responding in the admin area, so it will let you press the button and you think it’s updated etc, but it’s still using the older version of the theme.

Update the theme via ftp to version 5.5 and ensure WordPress is running 4.0. Disable any third party plugins which might be conflicting to see if the update is working as expected, then enable each plugin one by one to see if there was a conflict to see which is causing the problem.