As the subject syas. In the Apps & Addon packages page, clicking on the Update package list button does nothing. It used to work in some earlier version, maybe in 3.1 too, but it seems to be broken now. There is nothing relevant in /var/log/ispconfig/ispconfig.log or /var/log/ispconfig/cron.log or /var/log/apache2/error.log. I have a single repository, the default one (http://repo.ispconfig.org/addons/). Any help is appreciated.