I've been trying to open a finder window the usual way, clicking the icon on the dock, but it won't work anymore. No window appears. I can open one my clicking on the icon and then command+N but that's it. Things I've tried so far: deleting the plist, restarting my macbook, force quitting the finder. All to no avail. I'm on Yosemite 10.10.3. mid2013 MBA.