Since upgrading to Lion from Snow Leopard my Finder window has disappeared. It shows briefly if I swipe between desktops, but doesn't stay on any of them. If I click on Finder in the dock the top toolbar turns to Finder but no window shows. If I go to File > Open , nothing shows. Naturally this makes selecting files rather difficult. I've got it to show by typing "killall Finder" in the terminal, but this only lasts until I shut down. When I restart, it has disappeared again. Any suggestions welcome.