I've run into exactly the same problem, and never found out why. I'd love to know, however.
What I suspect is that it's run through some sort of security filter, and that strips out the FORM HTML. It's weird that it does that, I think. I think it should either show you an error when you try to enter the HTML, or something. But the HTML just silently disappears..
Your comment soothe my pain to an extend.
By the way I'm a real novice to this environment
So I'm still waiting someone else's help who knows the answer.
Jade, How about you? I found your name so often here and there.