Ecotect Analysis/Green Building Studio - Finding the Optimum Building Orientation 

Ecotect data was obtained from a different source, and a lot of the data within ecotect is not as up to date as green building studio. That is the reason for the difference.

anyone know the answer to David Morgan's question?

Why is there a difference between Ecotect's optimum orientation (155 degrees, in this project) and Green Building Studio's (180 degrees)?

What?? 180° from the original possition? or 180° from the 155 computed by Ecotect? if the second option is the one... could be a problem of initial orientation? North face facing south? or viceversa...?

Why cant I export my gbXML? "Next" is grayed out and I am never taken to where to save the file.