I’m trying to create a child theme of Clean Retina, but even with an empty child theme, the resulting theme is not identical to Clean Retina. The problem is in the menu bar. Let’s say I have this menu bar when Clean Retina is enabled:
Then, after activating the child theme, it looks like this:
The ‘Home’ link disappears and nested menu items are shown as regular items.
That doesn’t seem to be the child theme issue. Probably your menu has been switched to defaul. Please go Appearance->Menus and select the appropriate menu you would like to show there.