Apple doesn't have enough QA people. Maybe Apple's culture disdains the entire idea of QA testing. Grumph!
Latest episode. The Child account on our machines has a locked Dock. When I installed iPhoto 2008 Apple's own installer stuck an iMovie icon on the locked Dock. I can't remove it unless I escalate the Child account privileges, remove it, then restore them. A real nuisance.
Apple needs a knock on the head about QA.