Is anyone else having an issue when it comes to restarting or shutting down? It simply doesn't do either. I've tried the usual things like a PRAM reset and checking disk permissions using first aid, etc. It starts to shutdown and stays on the desktop (no dock, no menu bar, no apps open). It makes a chime when I press any key. I've waited and waited... I assume it's a process refusing to shutdown but it's hard to debug. Any ideas? It's been an issue on this machine since the beta launched. It's not my main machine but it'd be nice to resolve it.