Same issue as in http://answers.unity3d.com/questions/438030/loss-of-ui-after-pushing-play.html
Everything is fine but when I push play, most of the Unity Editor window goes black.
It looks like a problem with GFX card driver, but after upgrading, downgrading and trying different things, it remains the same. I have used Unity in several machines and it’s the first time I see this. I’ve tried my graphics card (Evga GTX 780 Ti) with other applications and games and works perfectly. It’s an issue only with Unity editor.
Before pushing play: Imgur: The magic of the Internet
After pushing play: Imgur: The magic of the Internet
Any suggestion will be appreciated.