This has all been fixed now...Took me numerous restores of my database on my testbed site but its working!

I tried various methods, but the end result was successfully converting the Real Name field in Joomla's own User Table to "Username" (Real Name and Username are now identicle)...Granted this isn't the ideal solution for most, but preserving Real Names isn't an issue for my site.

I am unsure why the first attempt corrupted the login, but it eventually worked.

As a temporary fix for new user sign ups I just changed the "Name" field label to "Username" (so I have 2 fields on the registration page titled "Username")...Followed by a small amount of text explaining that the individual needs to enter their username twice...I'll change that once I figure out how to get the registration fields properly modified!

I got 0 response or support from Community Builder staff which is the norm with them I find...I appreciate all your help Wolverine.