Hello @speckledjay,
Thanks for writing in!
Please update your theme to the latest version. Our latest versions are:
- Pro theme 3.0.2
- X theme 7.0.2
- Cornerstone 4.0.2
This latest release contains fixes for several issues so be sure to check out the changelog (http://theme.co/changelog/).
After doing the updates, always remember to clear all caches (if you are using WP Rocket, WP SuperCache or W3 Total Cache) when updating so that the code from the latest release is always in use. This will help you to avoid any potential errors.
Once you have the latest version, you can create the layout about in the Pro editor or Cornerstone. Simply insert the new Row element inside the column and you can have a nested layout. For some tips, you might want to check out our Youtube channel here: https://www.youtube.com/channel/UCgY5E3tOI83kBEahh9Y3uRg
Hope this helps. Please let us know how it goes.