Besides from being very hard to work with, the “Editor Window” often closes by itself when I am adjusting an animation curve. I cannot reproduce it but it happens daily. Some times it takes only 10 seconds before it automatically closes, other times I can work in the window for several minutes without anything happens. When the window closes I just open it again, so it’s not a big problem, just a bit annoying.
Windows 10 x64, Creator 1.0.3 (it also happened in all the earlier versions).