Ubuntu 11.10 just installed from scratch + few applications from Ubuntu Software center installed, log of installations.
Black area with stroked circle is appear and block UI. Please look at pictures.
Additionally I have a problem with focus during this area are about to appear or in the middle, selected text is blinking and some keys are ignore to type.
I had such problem on Ubuntu 10.04 + all updates(but without this area), that forced me to install new Ubuntu. The same effect I see under Unity2D, and Gnome shell. Windows Vista in dual boot works fine.
I just want to open issue against Ubuntu, but do not understand what component is it, Is there workaround? Any advice is appreciated.