So a few weeks ago, I installed Leopard on my PB12. It was way too buggy and unstable, so I reinstalled Tiger with a complete wipe, using the latest 10.4.11. But since I've reinstalled it, two Apple programs, Dictionary and iCal haven't been working. I open up the application, and they briefly appear in the dock, and then disappear. Do I need to reinstall 10.4?