I used it for a while yesterday (The 4.12.3Pro that is) with no problems what-so-ever. Did you by any chance use the online installer when updating. Some have been having trouble with it.

Was the brick wall there too in your old version ?
Are you using Pro or Basic ?

Here are some fixes for Limewire that you could try

http://www.gnutellaforums.com/showth...threadid=36420