How to solve: when using tab in gnomeTerminal , the entire screen flash,

When I first using the Fresh Gnome 3, I am confused, not adjusting it. But surely , it's effect is wonderful. The problem I encountered is : when using tab in gnomeTerminal , the entire screen flash, Then I change to flash the window title. You can change it in the following steps: System Settings -> System(Universal Access)->Hearing (tab)->Visual Alerts Of course you can turn off the effect or Flash the window title or Flash then entire screen.