When StarCraft 2 switch back to the active window to the window full-screen mode, the start bar will not disappear. I'm on Windows 7 64 bit and this has never happened before. This causes troubles playing as my mouse moves to the taskbar instead of letting me down during the games. After alt tab, StarCraft 2 is always placed behind my task bar, it was not before. I have no suggestion why this keeps occurrence every time I switch using Alt + Tab from one song or use another window.