It takes a while to get around to all apps and this morning I encountered an old Apple App that no longer works, "Airport Utility". It launches normally, reads all the settings and everything works until I tried to make a change when it reported an internal error and unable to complete. I knew it was coming but I am tempted to pay taps for an old friend of many years -- My Apple Router
If we knew what it was we were doing, it wouldn't be called research, would it?
