Thank you for writing such a useful plugin, and for putting in your time helping the people who use it.
My problem is that I when I attempt to add a Youtube video to my client's production site, the area of the screen in which the UI appears goes blank, and the video is not added.
On my own development site, it works fine. I'm using WordPress 3.4 on my dev site. The Firebug Java Console shows nothing when I click the button -- and I mean nothing. On my dev site I get two minor warnings about deprecated attributes.
Googling the problem indicated it might be the json extensions, but the PHP configuration has them. I suspect this might have something to do with JQuery conflicts, but I don't know.
First, I know it's a valid Youtube ID. See the screen image:
Here is the screen just before I click:
Here is the screen after I click:
Thank you for any help you can provide.