My problem: Spaces and Dock suddenly stop working. Only the current space is active and no other is accessible (via any means: e.g. cmd+tab, ctrl+arrows, going to one of the corners with the mouse, going to the spaces icon on the top bar...). If I open an application that is bound to a particular space, it will open but I can't access it. The same happens to the Dock: it just stops working (in my case stops popping up when I go down). It's happened to me twice in the past few days and both of the times I was the space where Firefox was running. Please help! It's annoying because if I have a document open in another space, I can't go there and save it before the restart of the computer (apparently the only possible solution). It reminds of the old windows time, too bad.