When you hover the mouse over the navigation bar the sitemap automatically expands. This can be very frustrating. Especially if you were aiming at the button menu just below the navigation bar but accidentally moved the mouse too high. The navigation bar opens which the hides the buttons. You then have to click somewhere else to close the navigation bar to get access to the buttons.

Also when you actually want to open the navigation bar you might think that you have to click it to open it. This often has the consequence that if you click the moment it open,s the click actually closes the navigation bar. Frustration!

In general the new navigation bar is a pain in the b..... Parton my english :-)

I suggest adding a person setting where you can choose it you want auto expand enabled.