You know how when you hover over a taskbar button, it highlights and a little preview pops up? When it breaks, I get the highlight, and the popup, but when my

You know how when you hover over a taskbar button, it highlights and a little preview pops up? When it breaks, I get the highlight, and the popup, but when my mouse moves away, they both stay there. Usually, I can move my mouse back and out quick, and the preview popup goes away and stays gone, but the highlight stays.