Melissa:
This may come as a shock, but I have had the privilage of runniing DOE2 since the cave man days (1984). Every version (DOE 2.1 A, B, C, D, E, and eQuest 3.55, 3.60 thru 3.64,have ALL had different results !!!!
This isnt one of God's 10 Commandments, its an energy estimation program. I am sure if you compare delta energy usage between windows, the Deltas between the two programs will be similar.
And in the end, who will know you don't have the 100% best glass, as you will have
have built the best buildng, and not the inefficient one.
And I agree on your 3.64 decision.