Pretty much everybody ignores the green ground wires.
I'll agree with Mark, if you get the same defect with two different pieces of hardware, then the problem is software, or I suppose possibly the computer hardware.
You haven't made any changes to your system that might affect the mouse lately, have you? New or removed mouse, mouse drivers, software, mobo, anything like that? You don't have any mouse accelleration turned on, do you?
McCoy- Do you actually have the red boards now, or are you sitting on the fence about ordering them?