Every once in a while, I will insert a DVD that will not play and I'll get the "missing LIBDVDCSS" error, but I know it's installed. The funny thing is, that when I load subsequent DVD's they take and extremely LONG period to load (No LIBDVDCSS error) and the system appears choppy (video, press eject button on dvd and it takes up to 2 mins to eject). Have not noticed any network, hdd or other affects of this, just things really seem out of place/choppy/slow. It usually takes restarting the Core to get things back to normal. Just an observation for everyone.