on my 2011 mac mini with amd gpu. I recently only had this problem though after updating flash to 11.2.2... not all youtube videos have this stutter. as a test, i checked the same youtube video with the stutter on my mid-2010 macbook pro and it played normally without any stutter. just weird and wondered if the latest flash update broke something with the amd gpu on the 2011 mac minis, specifically. so far, i have only experienced this stutter on some youtube videos, fortunately. anyone else having the same issue?