Yesterday my gnome's completely broken, cause there are unity launcher on gnome session. I have no idea why this happen, see the picture:
And i'am not able to access gnome panel
Reinstalling no give me result
sudo apt-get install --reinstall gnome-session-fallback
Note: before it, I was resetting gnome and this happen
The difference between Gnome Classic and Gnome Classic (no effects) is that the former runs Compiz. It seems Compiz has a Unity plugin, which if enabled, will bring forth that panel and menubar that is annoying you. See this link I found on the Ubuntu forums. The poster there used CCSM to disable the plugin. I don't know if that's the best way (CCSM doesn't have a great reputation, to say the least). You can search this site for alternatives to using CCSM.