Lighting not working after playing level

I am learning Unity and are currently doing some tutorials, at the moment I am doing the Survival Shooter.

After I play the level to test it seem lighting is broken and objects in the scene is all white. I am able to get the lighting to work again by loading a dummy scene and then back to the level 1 scene.

Any ideas what might be going on here?

Loaded scene, all ok


After test, not ok

 

I see this sometimes but only momentarily after exiting play mode. It always loads the lighting after I see this for a second from what I've seen.

 

For me the lighting is gone and and stays like that. If I add a directional light to the scene the game view shows up ok but all objects in the scene stays white.