Looks like someone set the title bar settings in Windows to too big. Go to ControlPanel >> Display and then the Appearance tab. Under the Item pulldown, look for Active Tool Bar and then check the size. You can turn it down to get it back. Good luck.
I found the solution.
It was actually a Windows settings, but not the "active toolbar".
In my italian version is "Titolo della tavolazza", I ignore the english tag.