I think this:

One space before Obdata?

For me Object and than ObData. It's more logical and intuitive.

just one thing, for me it is important that object data does not changes position, because it is only tab that changes your icons and for the new users can generate confusion.

I can confirm that Ruslan said. I have the same behavior. For me, when you put in full screen, the main windows is set for always on top.

the bug is present whit the initial cube too. it's very simple to replace:

1. open blender
2. the cube is select
3. whit "A" key select none
4. enter in edit mode whit tab
5. select UV Smart Project

In my computer desktop with geforce GTX 650, win 7 64 bit, I have the problem with the last build too. In this pc I have the 2.79 b version and whit this all work fine.

In my computer desktop with only geforce, win 7 64 bit, I have the problem. I see that the windows preference appears for one second in front off and then desappear rear the pincipal view.

I have the same problem with the old version. But with this version : blender-2.80.0-git.2778ecb58cd2-windows64 (02-05-2019) all work fine. I have notebook Asus whit hybrid Intel/Nvidia (Optimus) geforce 940mx and

I can confirm that. i have the same problem.