when I update my system several weeks ago, I started to see the nautilus menu in my desktop! I saw this because I had a transparent Gnome Shell panel.

Today I re installed Ubuntu and things seems to be ok. Then I installed a shell extension which will hide the top menu... When its hidden, I can again see the menu! Anyone know how to get rid of it?

Check the attached image... Its a gnome shell environment in Ubuntu. The top panel is hidden!