I ran the TED video first, full screen. It was fine. It was this one:
http://www.ted.com/talks/brene_brown...erability.html
I ran it on YouTube later--and if it was a caching issue, this experience would have been the better one.
The video, btw, is one of my all time favourite TED talks. I use it with my students.
More: I converted the YouTube file to MP4 and it played flawlessly on Meridian.