I created some CSS that relies on the <span data-hover> property being set on the menu and before the 1.7 upgrade, I could modify the menu from the Upfront editor by simply editing the menu and adding, for example:
Here is the site http://upfrontchildthemes.com/eleanor/
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But that went away with the 1.7 upgrade and if I try to set it in the editor, it does not persist.
I can add it to Appearance --> Menu from WordPress, but then it gets removed, again, when I try to use the Builder.
This is a fairly sizeable set back for what I'm trying to do with Upfront and CSS in the menu.
What is the reason and how can I get it to work?