Re: Double passwords
You’ll need to contact the people over at WPMU Premium to upgrade the theme.
Chances are they might already have an update for the theme you’re using.
You can tell if you’re using a deprecated theme by checking how you are setting the BP theme.
In the WPMU admin area, if you’re setting the theme via “BuddyPress > General Settings”, then it’s a deprecated theme.
If you’re setting the theme via “Appearance > Themes”, then it’s the new theme format.
I’m 99.9% sure the theme you’re using is deprecated, but I could be wrong.