Hello, I installed WordPress without utilising Softaculus, a server-side programme, then Buddypress, and ‘boom,’ I was done. Nothing, not even 404 errors, anymore. I won’t ever again use server-side software to manage my WordPress, at least not that one! Now that we know it does cause issues, I hope other people are not using it with their hosting either. The problem is resolved. I appreciate your promptness and diligence in making an effort to take care of me.