Here's something everyone can do to help debugging:

Enable the Console tab, from the combo box select "com.limegroup.gnutella.io.*", from the logging settings select "ALL" and let it run for 10-15 seconds. Then turn logging "OFF", copy/paste the text in the tab and send it to me. Make sure you tell me exactly what was limewire doing when you turn the logging on.

Btw the console tab is a lot of fun to play with, so play with it