Not sure what's happened to this forum lately. It's gone HTTPS, so this breaks YouTube embedding (since SMF only accepts non-HTTPS YouTube URLs).
I'm guessing that's what's in Ezra's post, as I get a big empty gap. If I hit Quote for his, I just get a bar that reads "Loading...". Clicking Reply then Insert quote for his post does nothing. I can't even read off the BBCode.
Yep, Inspect Element shows a YouTube non-HTTPS iframe.
I guess everyone else is using less-strict browsers. I still remember when Google broke whole-site translation due to some sort of frame security policy that Chrome completely ignored, but Internet Explorer and Firefox both obeyed; it got tangled up over HTTP/HTTPS and reverting the URL bar back to HTTP worked. That's fixed now, though, but this forum still needs a fix for only accepting HTTP YouTube URLs and then subsequently blocking them.