I'm not certain so don't hold me to this... I think that with the recent updates to both the mobile site and the streaming video section, there may have been some minor glitches. I noticed that the blue bar at the very bottom of the page has a dialog box where you can select between mobile or desktop versions of the site. I also noticed that it says 'Desktop 3'. My thinking is that in order to keep everything running, the desktop version had to be re-built a couple times and maybe those buttons became visible even though they don't lead anywhere.
I don't think it's anything to do with your browser or machine. It doesn't work on any of my platforms either.
Like I said, this is just my wild guess but I think it's a pretty good one!
