Well,
In this case I sugest you to either contact the HEC-USACE... (
http://www.hec.usace.army.mil/contact/contact.html)
or go through the Known Problems...
(
http://www.hec.usace.army.mil/softwa..._problems.html)
This seems to be a problem of the program itself.
Rodrigo Freire de Macedo.