Comment 6 for bug 755459

I too am having this problem, or at least I believe so. It affects the majority of the lower area of my desktop and affects all other applications running too. For instance, I can't scroll using firefox while hovering over this area. I can't paint in Gimp, I can't properly edit in Blender, etc... Running Natty 11.04 Beta 2 at the moment now. This don't affect classic gnome without effects at all. I can't vouche for classic gnome with effects enabled because I haven't used it.