This only happens with my TiBook and only then when 2 or more machines (2 imacs and a ibook) are on at the same time---all on airport....AND also when I am using LimeWire on two of them and, as Isaid, only on the TiBook. It's not anything that can't be worked around because I just relaunch it but I do have to force quit when the message appears.

I'm started to get used to the littleIdiosyncrasies of the app and will figure it our. Thanks much for your input.