I had this problem back with 10.4.0, but last time it went away when I updated to 10.4.1. I just reinstalled Mac OS X on my PowerBook, and I've let it sit for a day so it's not Spotlight indexing thing. Whenever I tell the dock to auto-hide, in order to get it back I have to be in the Finder. Magnification? I have to click on the dock before it kicks in. The menu doesn't mouse-over smoothly either, the highlight doesn't show until I click something. I've restarted several times already. Does anyone have a solution to this? This is a fresh Mac OS install, it shouldn't be behaving like this.