Yaaaaaaaaaaaawn…! Hey all, I’ve just decided to come out of a half-year hibernation from Unity. Wonder if anyone’ll remember me… Anyhow, I decided to pop open an older project of mine, and when it updated from a 2.x project to 3.1 the Game View, Scene View, and top control bar are solid white, seemingly incurably. I searched and noticed another person here with the problem, but they got no responses. I tried importing another old project and it worked fine, so its not a project upgrade problem, I don’t think. Its not a huge deal, I’m not working on the older project, I just wanted to take a look at it again. Thanks all. 
Hey dude did you ever find a solution to this? I just had the same problem with a project which was working fine a minute ago. It’s the second time it’s happened on this project and the only solution last time was to roll back to an earlier backup…
I found a fix for the problem but no idea of the exact cause. See my response here:
http://forum.unity3d.com/threads/64872-Trouble-with-a-White-Screen-on-My-Scene-View.
hi i was having this problem aswell and I found the problem for me at least but it may be different for you
it was caused by making another window open 
then pressing ok on there
that’s what caused it for me
I’m not sure how to fix it though
hi I’m back again already I fixed it by just closing and reopening the project