OK, as a postscript to the post above, what actually happens when I run 'java -jar Limewire.jar -Xdebug' is that LW starts up promptly, then takes a few minutes to connect..

Strange - the machine in question has a direct internet connection, whereas the other networked machine, on which LW works fine, is connected via the 'problem' machine, using IP forwarding (masquerading)..