I had this kind of experience in KahelOS, after kahelos upgrade I noticed that my gnome
has been upgraded to gnome3.0.1.
I found out after I logged in, No icons and I cannot do a right
click on my desktop. I open my console and tracked my files on my desktop and
its not deleted.
1. Install gnome-tweak-tool
$ pacman -S gnome-tweak-tool
2. Install gnome-shell
$ pacman -S gnome-shell
note: gnome-tweak-tool will not work without gnome-shell
3. Launch gnome-tweak-tool using console. Make sure that the File
Manager Have file manager handle the desktop) is ON
4. Uninstall gnome-shell $ pacman -Rnd gnome-shell
6. To right click the panel, press alt+right click