After migrating the
www.positivelivingsupport.org
site from Joomla 1.5 to a new installation of Joomla 2.5.9 and a new install of DTRegister 2.8.6b and setting up the configurations and all of the other items the site needed we are unable to make the Menu item work properly and show published events.
So this is not a DTRegister problem (on my site DTRegister list of events works fine) but rather a problem of how you call the controller 'list of events' from your menu item or via your link.
Also your event images are not displayed on your site. This might be a problem with your PHP version. What php version are you using? I'm sure,
a quick solution of your problem can be found.