Just checked the updateuser.php page and that has also broken. It's no longer able to enter any updates I make, and yet I haven't touched this page!
I'm at a loss as to what to do next. The insert looks intact as does the validation behaviour... :o( I'm certainly not getting any errors when I open the wizards which is often a good indicator that I have made a mess of things.
I've added the files of the reg and update page along with what I assume to be the associated webassist folder files.