Although no one else has responded here with similar issues, it appears that there is an issue as per the response below. Unless this is just a form letter response to email inquiries.
Response (Dustin) 04/08/2012 06:40 PM
Thank you for contacting Ancestry regarding the 1940 Census.
We are currently addressing the issues you are experiencing. The inconvenience is a temporary situation and hopefully will be corrected in the near future. Feedback from you, our valued customer, helps us correct errors and improve the website. Your patience and efforts to assist us in this matter are appreciated.
If there is anything else with which we might assist you, please let us know.