I've installed CCleaner v5.00.5050 on my Win 7 x64 machine. It has two monitors, and the taskbar is oriented vertically along the left edge of the left monitor. When I try to maximize CCleaner on the left monitor, it leaves a gap on the left side, and the maximized CCleaner window takes up space on the second monitor to the right. In other words, it's getting the coordinates completely wrong and is maximizing across both monitors.