We did not get reports that single product builder does not work after the update. We had the issue that single product layout was out of the container (and we have the solution for this) but the builder itself worked and user could see the changed.
You may provide video because I even don’t understand the exact problem you have because it’s backend issue and you don’t want to provide access to your site.
Anyway, to fix the problem we need access to backend and files. So, even if you make a video we will need this to help you.
In one of the last updates we allowed users to choose the different custom grids for the grid and list type of layout. Maybe this is the reason of your issue.
Go to Theme Options > WooCommerce > Shop > Products styles > make sure that correct custom grids are for both grid and list http://prntscr.com/snmg33 Also, you may try to select different custom grid > save > select correct one > save > check the frontend.