Is it possible that you can send me your drawing file for me to review it to see what might be preventing the floodplain mapping from working?
You can email it to me at the below address if it is less than 10 mbytes. If it is larger than that, you can upload it to our FTP incoming folder (make certain that you send me an email informing me of that).
Sincerely,
Chris E. Maeder, M.S., P.E.
Senior Technical Engineer
chris.maeder@bossintl.com