Refresh the page a couple times to fix
A few times i did see a still from the video for a fraction of a second, but then it got overwritten by nothingness.
Well, I wasn't much of a fan of watching videos when the same info can be conveyed in writing in 1/20 of the time. Now I just have more incentive not to bother.
Anyway, I won't investigate further. If there's a video i really really want/need to watch I can open it in Chrome, which sends all my data to Google anyway.