Hi, I’ve been having the same troubles with all of my sites using new Cornerstone elements. For instance, when I create a new section it will not display the background image or color in Cornerstone, but it shows up fine on the site. If I duplicate a classic section it works fine in Cornerstone and the site.
Same thing with formatting, new cornerstone elements do not show any formatting in the back end, (i.e. color, text formatting, buttons, etc.) but the appear fine in the front end.
I have disabled all plugins, flushed cache, disabled browser extensions and tried other browsers (currently on latest version of Chrome for Mac).


