I just upgraded to 1.3.3 and I see that you renamed some option_names for the sso related settings in the wp_options table. That made my install “forget” its settings when I upgraded.
From a WP plugin dev point of view, it’s considered poor form to change the names of settings options without also migrating the old settings on an upgrade. Many (probably most) users will blithely upgrade and not check to see if settings have changed. Because WP core devs are pushing for this more and more, many WP sites even have automatic plugin upgrades enabled and likely in the future more will. In this case, changed option names (or any backward incompatibility in a plugin update) will break a site’s functionality with nobody looking.