Updated Mac to El Capitan and magicJack Plus would not register in Corporate, therefore, it would take you online to magicJack website. When you went on "Chat Line" to inquire about problem they knew about it and would only say their engineers were working on it. No specifics. This has been going on for about a month and after five contacts on Chat Line I do not know anymore than I did on my first contact. They have not addressed this problem to their customers or noted the problem anywhere on their website. Do not buy a magicjack if you are on a mac. It will not work!