Please do a simple test:... start Youtube in browser and watch any video in normal view, them expand to full screen view, do several times expand normal to full screen and see if in full mode screen the glithes appear... in my system the glitches come on when I do this... then after a while it disapear and then came back again ... but if I don´t watch any video in ex: youtube, the system are normal and smooth... for me the glitches come when I watch videos... or if I use Final Cut Pro X, please tell us yours experiences. B. Regards