The solution: Head to the "Help" tab, and click the "Update Locksmith" button.

This will trigger a full reinstall of Locksmith's code into your theme - this is important, because Locksmith is able to do what it does via Liquid code in your shop's theme.

Note: if you had any custom Locksmith-related modifications performed on your last theme, those changes will likely need to be repeated on your new theme!

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