Cubase 8.5, can´t zoom in and out...?

I wonder… In my Cubase 7 on an iMac I can hold down the left mousebutton on the ruler, and zoom in and out by scrolling the mouse up and down. Now I have just installed Cubase 8.5, and I can´t do that anymore. The project window is also locked, so I can’t scroll to the right. Any ideas…?