Well It's no big deal, I just noticed the problem while browsing the projects sub forum and thought I would mention it.
For what it's worth, here's an update to the report:
In
this thread the first two vids are showing the error for me, but the video in
reply #6 is able to display without problem.
While it's impossible for me to see what the two first videos in the thread are, I'm guessing they are the two other gameplay videos from doc lulle's channel. I can watch them on the posters youtube channel just fine, which increases my suspicion that the problem has to do with the embedding of videos on this forum, as opposed to youtube or my browser.