gnome/gdm hangs after emerge

Hi, yesterday I've upgrade portage (about 30 upgrades) and now I can't
login gnome..."Oh no something was gone wrong".
After some changes and emerge (gdm, xorg and nvidia-drivers basically),
if I start one clear tty and restart gdm, I have half desktop like gnome
and half desktop like X

To understand this you can look a picture at
https://drive.google.com/file/d/0B3UY2_LU1HQOMIpmTGM4bTFzRDQ/view

To see my system with its errors look the last journalctl -rb at
https://bpaste.net/show/2f39d32de702 and emerge --info at
https://bpaste.net/show/93440bc84788

I'm being crazy to understand what's happen.

Kind Regards