This problem seems to be related to the one I posted earlier today. For some reason, any free events works fine however if you have a paid event then it seems to stall after you\'ve entered the contact details.
The site had been working fine up until I decided to update the dt_register component.
We found a couple issues in the 2.2.5 download. A wrong file was included. Please login and download it again. Problem should be solved. If not, let us know in a support ticket. Thanks and sorry for the inconvenience.