[Solved]gdm not start gnome3 && gmenu-simple-editor missing

[double_crane]

yesterday I found Gnome 3.8 was masked as stable.
So,follow the gentoo upgrade wiki , I migrate from 2.6.32 to 3.8 successfully.

and of course meet some small questions.

1.gdm won't start gnome.
gdm version is gdm-3.8.4-r3. and systemctl enable gdm.
at boot time , gdm shows login window correctly .
then I input my password , click sign in. then,,,nothing happened.it stopped ,,login window disappear and only a gentoo logo still at the center bottom of the screen , no desktop show.
I tried if input the wrong password ,it 'll tell me to reinput a correct one. if I input the right password ,login window disappear but gnome session not start , no matter my session choice is session ,gnome,or classic

If I use startx , I can login in to the gnome3 desktop.and use xdm , I can login too. systemctl enable xdm..but the xdm login window is so simple,and ,a bit ugly.

and I tried to set autologin in /etc/gdm/custom.conf,set
AutomaticLogin=dc
AutomaticLoginEnable=True
and when boot , gdm show a all black screen , just a mouse on the screen and I can move it . no other content,picture or form,only a black screen with a moveable mouse......

my .xinitrc
export LANG="zh_CN.utf8"
export XDG_MENU_PREFIX=gnome-
exec gnome-session

2.gmenu-simple-editor missing

in gnome2 , if compile gnome-menus package with USE "python" , there'll be a command "gmenu-simple-editor".
and I've use it to make some application not appear in application list.
but now in gnome3, gnome-menu 3.8.1 is just a library,doesn't provide the command

the gnome-menus 3.8 DESCRIPTION="Library for the Desktop Menu fd.o specification" while gnome-menus 3.0 DESCRIPTION="The GNOME menu system, implementing the F.D.O cross-desktop spec"
how to use gmenu-simple-editor?

thank you.

[double_crane]

I solved this problem

it's the /etc/pam.d/system-auth;

formly I use fingerprint device and add