Did you check whether the manual forwarded port is the same number as the listening port? (LW>Tools>Options>Advanced>Firewall)
Did you also add the necessary numbers at your router website?
Maybe deleteing the LW preference folder for a start will have an effect. Read here on how to do this (Point #2 & 3 in Fixes for Limewire)
http://www.gnutellaforums.com/showth...threadid=36420 