Hi, I read the gnome session documentation and got it working !
The issue was with the configuration of applications to launch at session stratup in the user configuration directory : .config/autostart I had a gnome-shell.desktop file (that I created a while ago) to run the "gnome-session --replace" command. It was disabled in gnome2 configuration but was executed when a gnome3 session was starting. gnome-shell was starting twice leading to an unusable desktop environment. I removed all the files in the autostart directory except conky configuration. Now gnome-session and gnome-shell works fine. I hope this helps. Regards, Jonathan Dray
