Screen Tearing in Editor?

I just updated to the latest unity and I loaded a project example called StrangeIOC to start learning about Inversion of Control. But when I load the sample scene this happens.

Screen Tearing?

I've had this problem in unity before with the GUI in my own project but never found out how to fix it because in my project it only happened when I was loading a level and displaying level loading status.

What is it called when the screen i guess tears like this and how can this be fixed?