I am using WP MU, BP and the Supporter plugin.
It seems that when the supporter plugin is enabled I cannot see the BP (site admin) menu when I log in to my dashboard using site admin credentials. It looks as though the 'Supporter' menu is in the place where the buddypress menu should be.
N.B. On the network admin screen I can see the BP menu item OK, it is only on site admin pages where I have a problem.