I have been using an Intellimouse Optical for a year now that is hooked up to the USB port on an Aopen AX6BC (BX chipset) on a Win2K Pro system. Sometimes when i'm just moving the mouse in normal use without any bandwidth intensive applications running (ie CD burning or games) usually to the left for some reason the mouse cursor hiccups and stops moving to the left for a brief second. And remember I said normal motion not a sudden fast twitch. My friend has encountered essentially a similar problem with his Intellimouse Optical (and we're both using a regular carpet mouse pad or whatever it's called). So I'm wondering does the Intellimouse Optical or all optical mice just wear out eventually over time or what's the deal? Could there be dust on the lens that I might have to clean or is it something wrong with the Intellipoint software? I have version 3.2 installed I believe. I thought that getting an optical mouse would rid me of these kind of issues that come with ball mice. Any help would be appreciated.