@punch -> Check usergroup permissions and settings to make sure it is set up correctly. In some cases, saving the usergroup perms (even if they looked right) seemed to do the trick. Most of the time when people are complaining about it not automatically converting, they are expecting it to convert old posts or posts that have been cached which it will not do without the rebuilding tools.
@Soccer. Only with the URL. The embed code is HTML and you would need HTML enabled in order to show that (which wouldnt be a good thing

)