Maybe a silly question but... Running Windows 7 Home Premium, 64 bit, and IE 9.
I usually have IE windows open monitoring 6 different forums. When I hover the mouse over the IE icon on the task bar, the 6 IE windows show preview panes across the bottom of the desktop, in the order in which they were opened. Sometimes the order of these preview panes changes. What causes this? Where/how are these preview panes stored?