Always when changing things around (theoretically improving) there’s bound for something to go wrong.
In this case, the main menu dropdown functionality failed on WordPress installations that used the automatically-generated menu and not custom menus. But this is now fixed.
The short changelog for this update:
- fixed the issue with dropdown menus failing to work on automatically generated menus
- fixed the layout widths slider failing to work in WP 3.6
- fixed/improved mobile menu where it used to select incorrect item when the viewed page was not in the menu