@pikahyper: Right, but I meant was she pasting the embed code into that instead of the URL code. I've seen a couple people do that, because that's how it used to function before the relaunch (despite it saying URL)
@icarusflies: What is the specific URL that you're trying to embed? Are there multiple URLs, or just one that's causing problems? Every once in a while a Youtube URL will return an error, even though most of them work fine.
I'm having a similar problem that's been going on for a while now, I try to upload a Youtube video and it says Comicvine doesn't recognize the URL. I have Chrome, Firefox and IE and it won't take the URL on any of the browsers.