I turned on my iMac to night to find that an outlined box around the highlighted icon on my desktop had appeared. In the example attached it is around the Microsoft Windows XP.pvs. If none of the desktop icons are highlighted a little outlined box shows up in the upper left hand corner of the desktop. The other odd thing is that the same outline is around the red ball in a program to close the program out or any icon in the program that is highlighted at the time. I didn't change any settings on my desktop or programs that would make this start happening. Does anyone have an idea of how to turn this off?