WordPress, Multisite and BuddyPress Please Help

Freshly new installed wp 3.0.4 MU three times but no joy with BuddyPress and WP Multisite and domain mapping tool. Downloaded the domain mapping tool and read the tutorial - still can't get rid of pesky page not found.

Every link on the base main site works fine. Every site using domain mapping tools fails when BuddyPress theme gets applied.

home page - all good

/activity/ - Page Not Found
/members/ - Page Not Found
/groups/ - Page Not Found
/forums/ - Page Not Found
/blogs/ - Page Not Found

/about/ - all good

With or without wp caching the issue remains the same.