The following mnemonics in property dialog are conflict. * '_Add' button * '_Animate transitions between labels' checkbox version: git-6843f805
Fixed in http://git.xfce.org/panel-plugins/xfce4-weather-plugin/commit/?id=b6aa9ed936341c93887c44a348d9300524ed0117. => 'Animate _transitions between labels' checkbox Thanks for reporting.