Did you try trashing you preferences, starting FW so it creates new prefs, close FW, and then use the list from (edited because new version available) ? If no, you might have another problem, the solution worked for almost anybody here, on FW official forums and Ubuntu forums.

__________________
Liens d'intérêt /Links of interest:
Gnutellaforums en français /The House's rules you have to respect / First search the forum, then create a thread / Free software alternatives! - Logiciels alternatifs gratuits!/