I set up the system messages so that I would not see authentication messages. When I am looking at the console (firewall, for example) and someone does not authenticate properly, the system message tab will be given the focus, taking me away from what I was doing. It does not show anything in the window, but it grabbed the focus nonetheless.
After doing some things in different parts of the program, the gatekeeper program will suddenly close. when I reopen it, strange things will occur. Today it happened, and the system message tab was no longer visible, so I had to go back to view and reselect it. Also, The DNS service no longer showed any bindings. We could not browse the internet because it could not resolve addresses. I had not made any changes to that module before GK suddenly closed.
* Edit - If I stop/restart the WG service, the bindings reappear again.