Hi Rodney, not sure if the same deal but I was suprised to find it pop up again on my site at the weekend after an update.
Registered again and it said my details where updated so I assumed it was just new functionality (i.e. ask you to register again after a set time to ensure Moodle stats are up to date). Must admit I didn't look at the docs or anything to see if my assumption was correct
I have been unable to get rid of the registration button since moving to 1.8 so not sure what that is. Even after updating registration, it is still there.