Blank Screen after login with GDM. I use Gnome Shell 3.16

Hello, I want to ask
I just upgraded my gnome shell from 3.14 to 3.16, but when I logged in using gdm as display manager it just appears blank screen with movable cursor . I've tried to reinstall but still can not works, what I have to remove my gdm or I should return to my gnome 3.14?
I've followed the guide from http://www.omgubuntu.co.uk/2015/06/how-to-upgrade-to-gnome-3-16-in-ubuntu-15-04