Unfortunately that doesn’t really help. The video shows up in the post preview and then it disappears when the post goes live. I have been playing with it a bit and a text link will show up and still delete the video code. It didn’t do this until I upgraded my account.
I deactivated all the plugins and changed the the theme. I did some test posts and the one that was just text came up fine. However the one that was a link to a YouTube video disappeared, except the title of the post. I noticed that all of the queued posts that have disappeared have been video links.
A slightly modified Twenty Ten, Version 1.5.