Did you try deleting your Limewire (LW) preferences? To find them do a search on your computer for limewire. Your LW Prefs are in a folder called .limewire Delete the entire folder. (FOr mac that's a single file called .limewire.
When LW is open, click Tools->Options & go to Bug report & click for an example. In the window that appears scroll down to the part that says: "Recieved incoming this session". If it says ‘True’ then LW has no problem with firewalls, but if 'False' it does have a prob.
For macosx that is LW's Prefs & Bug Report, & for OS9 that's Options & Bug Report (I think.)