Unity 4.0 Workflow turns black when test playing game

Hello! I’m having problem test playing my game, when i press the play icon it goes to game view but the workflow turns black except for the game window and scene window (see link)

http://www.flickr.com/photos/91599704@N05/8318133703/in/photostream

I can test play a game in unity v3.5.7 and i have try re-installing unity4.0 whitout success.

What can i do to fix it? Anyone else having same problem?

i’t was just me that have accidently changed the color of the playmode tint, if anyone having the same black workflow go to preferences–>Color–>and change the playmode tint to grey or click ‘‘Use default’’