The system must be hijacking those key combinations. I don't use a Mac so I am at a loss as to how to even check.
The FaceBook page that is a closed group has more traffic and likely would result in better advice. If you are a member there in that closed group, I would recommend posting there. If you are not a member there, approval is usually fairly quick. But if you are not a person that uses FB (I wasn't for a long time after Quark created it and only use the Quark closed group), I would be happy to post there for you and perhaps point to this thread.