In Windows 7, in the Aero interface, if you move the mouse over an icon it gets highlighted. This is definitely pretty, but sometimes the system gets into a state where the highlight gets stuck, and whichever button you hovered over last with the mouse cursor remains highlighted even when you move the mouse out of the taskbar. This can be very distracting if you're expecting the taskbar icons to tell you something useful, such as displaying a progress bar or turning orange if you have a new IM.
I did a bit of searching about this issue, and the only thing I came up with was this. And the response, from Microsoft support no less, could hardly be less helpful. The question was, "the highlighting gets stuck sometimes and doesn't go away until I reboot." And the answer basically says "did you try rebooting? That ought to fix it."
So, does anyone know anything useful about this issue? Does anyone know what causes it (and thus how I can avoid having it happen)? Does anyone know a way to fix it that does not require a reboot?