BuddyPress.org

Hi,
I’ve created a BuddyPress site in the past that worked very well, so I’m even more irritated about why I cannot figure out this issue. I would really appreciate your help!
When I open the member’s page, go to a member’s detail page and click on “Profile”, them I get directed back to the homepage instead of seeing the profile. Same happens with click on “Friends”, “Groups”,… My members have extended profile fields which aren’t shown.

My site: http://www.business-whoiswho.com/
WordPress version: 4.3.1
BuddyPress version: 2.3.3

I’m using a child theme of the Bounce theme provided by GhostPool. But the problem is not in the theme, as I deactivated it – activated 2 other themes – same problem.

Example of a link that is supposed to open a profile: http://www.business-whoiswho.com/members/9734642/profile/

Thank you very much in advance.