What would cause my mouse to act this way. It is a PC (Dell) running Windows 7. The mouse is a USB one with a red light in it not a ball. The left (main) button seems to be misbehaving. It seems to single or double click fine, but when I try to drag, it often stops dragging leaving the rectangle behind or stops dragging then starts again later in the move. I don’t believe it is the mouse itself as I’ve tried a second mouse that does the same thing. I don’t think it is the driver as the second mouse was an HP mouse and when I plugged it it, a new driver installed itself. It’s definitely not a specific program as the mouse misbehaves in many of them.