hmm, WinXP home Im using (though in terms of performance, it tends to perform just a teeny weeny itsy bitsy tiny bit better than Professional, so that aint an issue. XP itself though, that I could understand.). If it's the OS, adobe better get their ass and gear and release an update fix. I dont use the graphire mouse incidently. Its annoying to not have quick access to a mouse when using the pen so i use my logitech optical. The graphire mouse is great, but i need'em both at the same time.