fedora 19 gnome doesn't take over

[jehan procaccia]

hello 
I installed fedora 19 on 3 systems now and all have the same problem. 
when X11 start , it show the traditional fedora logo in the center of the screen , but
then nothing else, no login screen, gdm or whatever gnome-shell should take over after:-(

Xorg.0.log doesn't seem to show any pb , you can have a look at it at:
http://ur1.ca/ej37t 
but /var/log/messsages do show errors : JS ERROR: !!! Exception in callback for signal:
sessions-loaded 
I check bugzilla, and came accros https://bugzilla.redhat.com/show_bug.cgi?id=959941 
but still, I cannot find out how to finnaly resolve my pb and get a graphical login screen
. 

thanks for your help .