I have a shiny new iMac, had it 3 weeks or so, and quite like it (ex Windows user here) In the interests of making it mine, I supposedly changed the look of the dock but now I find I cannot remove anything from the dock at all. I have an invisible icon on there from a Firefox beta version that I tried out; I can see it says Firefox if I hover over it but it isn't there, I can't click on it with my left mouse button. I want to take things off my dock - ichat doesn't work from there, not that I use it. I haven't got parental controls on. When I click remove from dock the dock itself disappears downwards off my screen and then comes back, with the icon still there. Same if I drag an icon off. I've tried removing the dock.plist doodah but nothing seems to work, I really don't want to wipe it and start again.