When I get this problem and it sticks while downward or upward dragging, I sometimes am able to defeat by right clicking on the highlighted area and then left clicking again in the previously highlighted area. That works about 80% of the time the other 20% of the time I just switch to the keyboard method when it doesn't want to go away. I'm using win 7 64bit with a logitech mouse, if anything I'd blame logitech first