[xwiki-users] Really stuck on registration form

Please help! Have to edit the registration. I have added Xwiki registration and started off by copying registerinline.vm into it, and removing the outer if clause I have added several properties to the xwikiuser class, and by looking at the code in registration have got the new fields in. I have added the new fields to the profile pages too. When I register a new user and go to their profile all the new fields are blank - they display their boxes, but nothing in them. Have I missed a step somewhere??? Very happy to share code if needs be but I am really stuck! Could somebody please help!