This was a known bug for the Dec 20, 2006 version.
This has been fixed some time ago. Please download the latest version of StormNET from here. You can install directly on top of your installed version of StormNET.
http://www.bossintl.com/products/dow.../StormNET.html
Please let me know if you have any other questions.
Sincerely,
Chris Maeder, M.S., P.E.
Senior Technical Engineer