Comment 36 for bug 986208

 Changing the order in the dconf key:

"/org/compiz/profiles/unity/plugins/core/active-plugins"

to read:

['core', 'composite', 'opengl', 'decor', 'gnomecompat', 'resize', 'snap', 'move', 'regex', 'place', 'vpswitch', 'grid', 'widget', 'compiztoolbox', 'session', 'imgsvg', 'mousepoll', 'imgpng', 'animation', 'wall', 'unitymtgrabhandles', 'workarounds', 'ezoom', 'fade', 'unityshell', 'scale', 'expo']

Fixed the issue for me, in Ubuntu 12.04 64bit. For those that are saying it's not working for them, make sure you have "Ubuntu-Tweak" installed. I recall in researching this issue, coming across a claim that a dependent package installed with Ubuntu Tweak, corrects another issue with screen triggers being retained across reboots.

Also, I know this should be obvious, but if your machine won't do 3D acceleration these compiz plug-in's just plain don't work