Sorry if this is a duplicate!
I installed Cairo-dock in order to test it and see if it suites my likes, but it seems to have enable some effects to Gnome classic (no effects) session of Gnome: namely, shadows around application's window, and that flash thing when I click on an application's icon on the top bar of Gnome. I'm under 12.04 and I wonder if there is a way to _fully_ control visual effects under Gnome classic (no effects) enviroment... Thanx