Unity team,
I posted this a month ago but it still doesn’t appear on issue tracker. Can you please confirm it so I can track it?
Navigation window causes tint problem.
I also noticed that Lighting window also causes the tint problem in Unity 5.1
All the details are here:
Doesn’t happen to me. Maybe it’s something with the drivers? I’d suggest reinstalling your gpu drivers (and windows, if you can - ignore that bit if you’re on a Mac, while not as good as Linux, it still beats Windows by light years).
Me and my team experienced this issue on many computers, different operating systems, different drivers, different settings. Unity team also confirmed it at last as you can see in this post : Bug: Scene view is still tinted in play mode when Navigation window is on - Unity Engine - Unity Discussions
About you comparing Mac with Windows: I think you don’t have any idea about the benefits of developing on windows over Mac. 
Closing this thread, it’s essentially a duplicate and in the wrong forum.