When you return from a menu (for example the "Video Settings" menu) by using the Done or Cancel button, the button you used to get to that menu is selected without being highlighted, so that you can re-open that menu by pressing either Space or Enter. When pressing Tab, you however highlight the first button in that menu, which shows that this might be a bug.
- Open a menu
- Close that menu by clicking on the Done or Cancel button
- Press Space or Enter
- You re-enter that menu. I would have expected nothing to happen, as none of the buttons in the parent menu have been highlighted.