Kelly. It means I installed a Sonnet L2/G3/350M/1M processor upgrade. As you know the 4400 is one of those 'non upgradable processor' computer, i.e the original 200 Mhz 603e is soldered. Sonnet and a few others came up with a G3 upgrade card that plugs into the original L2 slot. This has been working fine from the day it was installed some 3 years ago.
Dreambird (and kelly too). Turning off Virtual Memory did not help. But reading Apple's iTunes discussion list about iTunes 2.0.4, it appears that quite a few people are reporting quite a few "if's and but's" about it. Come to think of it, it may very well be that this break up problem started when I updated iTunes to 2.0.4.
Anyway, I'm giving up on this problem as who wants to look at the iTunes window while listening to it.
jb