Buddypress user blogs issue

Hello! I installed Buddypress on a site for someone and created a simple child theme for it. Everything’s working as it should (as far as I can tell so far), except for the user-created blogs. They get created, and you can see them. However, you can’t access the WordPress login page, the site is unformatted html, and obviously no theme is applied.

Any ideas?

Thanks,

Aireck