We are getting an issue when submitting a pdf form where the fields and values are all concatentated and sent as one variable. It is impossible to parse this.
While looking for a form i came across this blog entry and his test does the same thing!
Wow what an overwhelming response, i guess adobe only answer such basic questions if you cough up the cash for a support contract. Either that or the fact even though their own bloggers can't get it to work says to me it's just a broken product. Weak sauce.
For what it's worth, I'm having the same problem. Like you said, the POST data is impossible to parse! If I can't get this resolved quickly, I'm going to have to re-create two very complex forms in HTML.