For some reason, one time yesterday I got Limewire to run smoothly with my other applications for about an hour! First time! Then all of a sudden the problem started in out of nowhere, spinning beachball forever on iTunes, internet etc. Finally once beachball stopped I closed Limewire and everything instantly started working perfectly again.

I am running the exact same programs on two other MACs, and not having this problem. (G4867, PB 667) I wonder if it is related to the G4/400 processor?

But why this time was it fine for an hour of extensive use? In that hour I was downloading extensively, playing iTunes and using the internet. Usually the problem starts immediately when limewire is launched.