Re: Gnome shell disappears after first logout - login cycle
You didn't install the alternate status menu extension, did you? There's a bugged version going around that causes that on login. There's a fixed version in the webupd8 ppa
If you move your ~/.config/dconf folder to somewhere else, it should get regenerated on next login, so gnome-shell starts. At least then, you're not redoing everything, just the gnome settings.
"I was dead long before you were born, and I'll be dead long after you're dead."