BuddyPress.org

Hi,
I just configured a server running WordPress + Buddypress Multisite.
After a lot of struggling with the server setup i finally got everything to work, except a little issue.
I posted that on wordpress multisite forum but it seems like here is more adapted.

When i’m on a sub-site (site.domain.com) and i click the register link on the right (i use buddypress default theme), it sends the user to site.domain.com/register, page that doesn’t exist, since the actual register page is located at domain.com/register.

Any hint on how to change this?

Thank you.