Just got a new 15 in PowerBook. Everything works great, except the Kensington MouseWorks driver will not recognize my trackball (it recognized fine under that same OS version on my dual G4 tower). The exact message is: The MouseWorks driver is not running or could not be found. Try installing MouseWorks again Reinstalling has no effect. I have run into several references to this problem, but no fix. The Kensington site has nothing. Anyone know the fix to this one?