This was such a problem with an early version of the WeatherTool released just after the transition. If you download and install a later version of Ecotect, this should sort it out for you. Detailed information on how to get a download link is available at:
http://ecotect.com/support/licence_details
Hope that helps...
Andrew
--
Dr. Andrew Marsh
Ecotect Support Team
Autodesk, Inc.