I am just getting started using my new macbook (using OSX 10.5.5), and I can't keep the time zone from slipping back to GMT, so my e-mail and calendar events are listed as 5 hours later than they should be. I go into the time zone menu and change it to EST. It shows up on the map as EST, but when I close the window it resets itself to GMT, regardless of whether I've locked it or not. Help! I've searched the Help menu, but can't find anything useful. Thanks!