Hi Guys, We now have plugin that works with Joomla 1.5 This plugin has been tested with Joomla 1.0.11, 1.0.12, 1.0.13 and 1.5 and single-login should work fine. This module does not work with JoomlaCommunityBuilder. There is a special module instead of this one. Read more about CommunityBuilder integration: http://www.amember.com/p/Integration/Joomla-CommunityBuilder So, if you need to upgrade current one to include Joomla 1.5 support please contact us via helpdesk.