@malevolentia: Hello there,
That is why it is recommended to create a child theme before making any changes to the core theme files.
Can you please post in your site URL and let me know what changes you have made to the theme files?
Yes, 2.1.1 was the update that fixed the Section Sorter issue.
If the change you made to the theme cannot be reverted Download the latest theme folder from your catch themes account page and copy the file customize-custom-controls.min.js to the theme folder you are using. This should solve the section sorter issue.
Let me know if this works out!
Kind Regards,
Skandha