Do you have Force IP checked? Something to try. Also try deleting your LW preferences folder whilst LW is CLOSED; found here Macintosh HD/System Folder/Preferences/.limewire
If you put the preferences folder into List mode for viewing, you should see them at or near the top of the list.

You do know how to rebuild the desktop right? It's something that should be done reasonably frequently. Particularly after installing software or updates. Restarting whilst holding down the Command + Option keys : Rebuilds the Desktop file