I have a Logitech Cordless Click! Optical Mouse, a GeForce 8800 GTS video card, and a Mitsubishi NX86LCD monitor. When I connect my monitor with a DVI cable the mouse gets all screwy. It moves really slow and erratic across the screen. And it doesn't click well. I have to click several times and very severely to get it to recognize the click. Then when I switched out the DVI cable with a VGA cable with a VGA to DVI connected on the end connected to the video card the mouse works flawlessly. I have no idea how these to things would even affect each other. Any help or ideas out there.
I don't see why that would happen, but try changing your mouse settings in the Logitech Mouse properties.