BuddyPress.org

No I was not logged in and
yes I am now trying thr default theme and it seems okay so far.
I notice with the default theme that if I enter an already used email address or username I get an error message.
I dont think that was happening in my other theme so I guess thats a clue.
Not being a programmer I think I will go with modifying the default theme rather than trying to make something else work.