gdm won't works after upgrade

Gmail <[email protected]> Mon, 22 Jun 2015 13:40:42 +0200

Newsgroups	gmane.linux.gentoo.amd64
Message-ID	<[email protected]>

Hi, in a system with gnome 3, systemd and gdm as LM; i can use only
startx to login.

After the boot, the gdm welcome appear right, but if i try to login an
error message stop "Don't works!! Try again" then Alt+Ctrl+F2 to start
with startx command.

In the log there aren't error message...