I am running DT Register 3.0.9 with Joomla 3.2.4. I am unable to change the thanks email subject text in the configuration email tab. I can enter the new text, but the save & close button has no effect. I am using Firefox 29.01 but also doesn't work with Safari 7.0.4
I also had a problem with manually entering registrations: One of my required fields was configured as radio buttons, and I could not select either button from the back end, but front end users had no problem. I changed it to a dropdown and that worked.