Re: new 2.8.1 mu + buddypress.. theme bug
A little more info on this bug.
For theme selection, the “BuddyPress Settings” page is looking at the themes in wp-content/themes, yet it loads the theme from wp-content/bp-themes.
That means that to use a bp member theme, you need to have a copy of the theme in both the wp-content/themes directory and the wp-content/bp-themes directory.
This means that the generated HTML ends up loading the CSS and templates from wp-content/bp-themes/<themename>