@Daniel - Greetings!
-- I am not a security expert and, therefore, ask that you help me understand why I am rather consistently encountering challenges to BitDefender's certificates.  Please see attached.  

-- What is the mechanism by which Bitdefender inserts itself into the certification/authentication path to advise me that a website/page is safe or not?  Is that necessary, since I have implicitly "trusted" Bitdefender by installing its software?
Thanks & regards. 