Buddypress panel not functioning on some sites

I'm redesigning my site using Studio theme and while the BuddyPress panel works fine on the main site home page, it's not appearing on any other sites in the network. Is this normal? I wouldn't think so, otherwise people wouldn't be able to easily log in from their own sites.

I can't really tell if this is a Studio problem or a BuddyPress problem, but when I tried using the default BP theme, everything seemed to work just fine.

Any ideas?

Here's my very rough site:

Thansk.