Ubuntu 12.04. The first time I log into Gnome Classic I get a duplicate of every menu, panel indicator and taskbar entry. If I log out and back in again I now have three copies. Log out and log in, four copies and so forth. What would cause this? I can't see any obvious duplicates in the process list: $ ps -A | grep 'gno\|org\|nau' 27439 tty7 00:00:18 Xorg 27610 ? 00:00:00 gnome-keyring-d 27621 ? 00:00:00 gnome-session 27674 ? 00:00:00 gnome-settings- 27709 ? 00:00:07 gnome-panel 27720 ? 00:00:00 gnome-fallback- 27726 ? 00:00:04 nautilus 27736 ? 00:00:00 polkit-gnome-au 28281 ? 00:00:00 gnome-screensav 29016 ? 00:00:00 gnome-terminal 29021 ? 00:00:00 gnome-pty-helpe If it helps, I was recently trying the Nouveau drivers but have now reverted to NVIDIA. Configuration is Separate X Window, Xinerama enabled. Unity is fine, so the problem is limited to the Classic desktop. I haven't had any luck googling these particular symptoms so any tips would be really appreciated. Thanks!