If you have not upgraded to the latest version of 2013 you could be suffering from the over-docking toolbars mess.
The newer versions of 2013 fixed this early glitch.
What happens is the toolbar activates but it's docked in the topbar underneath some other toolbar[s].
Dragging all of these off so they float, then docking them as desired will fix it.
If this is not the case... have you being using two monitors or changed screen resolution.
This can sometimes cause toolbars to appear 'off-screen'...
You can try using the Toolbar dialog's Reset on that just that toolbar ?