BuddyPress.org

Hi,

I was experiencing a similar problem – try checking to see if there are any tables in your database starting with wp_bp:

wp_bp_activity etc etc…

I think buddypress needs these tables to work and for some reason they are not being created. I copied the database structure from a working install of BP (44 tables) into the broken install – which only had 17 tables and things seem to be working.