IntelliMouse Optical 1.1A USB and PS/2 Compatible problems Symptoms: I click on menu item and menu drops, disappears, drops, etc, as if I'm clicking in rapid succession. I try a single downclick and hold and the same thing happens. I uninstalled the software 4.0 and installed v3.? (whatever is currently on the ms website). No change. I'm considering that the hardware is bad. I need to try this mouse on another computer. Meanwhile, if you've had a similar problem, please post your solution. Thanks.