Hello,
I've the same problem as the guy in the topic "Next button not working on registration form". I've found something out:
When a registration form contains more then one radio button, which defined as mandatory fields, the next button is without function. If it is only one radio button defined as mandatory field, all works fine.
I hope you understand my bad english and you can help me.
I use the Version 2.5.9
There is no such limitation in DT Register. Chances are you have not created your radio button fields correctly. Watch our custom fields video tutorial to see how proper setup is done of custom fields. Check your fields to make sure things are correct. If you believe they are, submit a support ticket with site access and we'll check it out.