I had DT Register working before I forced the entire site to use SSL (which is required.) All through the process the protocol is HTTPS, however, since enabling this, the "next" button on the Billing Information page will not work. Clicking it does nothing, so I cannot complete the registration.
I cannot use the System - DT Register SSL plugin because if I enable that, users are unable to login to my website. It simply just tells them they must log in over and over. (If I turn off the plugin, it restores login functionality.)
I don't think I need the plugin, since all of my site is HTTPS already, but the "next" button not working because I'm not using the plugin?