Problem after upgrade to libgtk2png3 dependant Gnome2

[yannski@www-aius.u-strasbg.fr]

Hello,

I encouter some serious problems here after upgraded my gnome2 install to a
libgtk2png3 based.
My .xinitrc is as follows :
export WINDOW_MANAGER=metacity
export GDK_USE_XFT=1
exec gnome-session

The system complains about a missing file : gconf-sanity-check-2 (only
gconf-sanity-check-1 is available in the gconf2 package). In addition, any
Gnome2 apps takes several minutes to launch.

What's the problem doc? How can I make it run better?

Thx

yk