I have recently bought a Wacom graphore tablet with cordless mouse and graphics pen. They work GREAT for about one hour, then the cursor goes haywire. It veers in circles for a while then floats anywhere it fancies, paying no attention to where I'm trying to point it. If I manage to waver it back towards shut-down as an option, the iMac freezes. Any ideas? I am running system 9.0.4 an iMac DV 400mhz with 256 MB memory installed. I used to have UniMouse Overdrive installed as an extension from my last mouse. Is it possibly something to do with this? Or something more obscure? Thanks.