The Navigation Bar is contextual menu (meaning it changes depending on the context...i.e. which module is current). You can toggle this bar on or off. As of v2013.1.0.0, this Navigation Bar is turned off by default. See the following if you want to turn it back on.
Show (or Hide) the Navigation bar
Go to Edit ➤ Show Navigation Bar.
If there is a check next to this item then the bar is shown, if there is not a check then the bar is hidden.