I have uninstalled all plugins and reverted to bp-default theme, but this issue persists. In one case,a new user signed in, was replicated in the member directory about a dozen times. By the next day, the listing had gone back to just one. Others are still listed multiple times - see atlantagardeningforum.com/members/.
Really disheartening as site is just starting to acquire good traffic and members. I have also tried uninstalling bp and reinstalling, but do not care to try to edit any mysql tables etc.