There's a file in the download section of this site that will remove that extra profile field you've added:
Member Field Strip - English Version (#!/usr/bin/perl)
Hacked your UBB.classic to add extra member profile fields, and now you have to remove them to upgrade? Download this file.
Custom user titles are one of the many features found in recent versions of ubb. Here's a list of the major features added since 6.0 was released:
https://www.ubbdev.com/ubb/ultimatebb.php/topic/10/2234.html Upgrading to 6.7.3 would/should clear up the registration issue you are having - quite possibly a permissions error on a file. you could try one of the rebuild members links in your control panel to see if that clear it up, or at least reset all files/folders in your Members directory to 777.
