Could you give me the URL of the form? You can get it by going to the Distribute tab and click on "Copy Link". I'll try to investigate the problem.
One thing to check is that you'll need to make sure you copy the embed code into the <body> section of your HTML. Do not put the embed code in the <head> section. We have seen the similar problem when a customer pasted the embed code into the <head> section. In that case, he could see the whole form in the preview, but only partial form in the live page. It's very similar to your symptom.
The problem was found to be the preview feature in Dreamweaver. If the page was uploaded to the web site and then viewed via the web, it appeared correctly. Unfortunately trying to preview the page in Dreamweaver does not work. It seems fixed at 400 pixel length no matter what size you try to set it. Not sure why that should be but at least the form is working correctly on the web.
Thanks for your help.
Again, it's great to know things are working fine on your web site. Please don't hesitate to let us know if you have any other questions.