So now I have isolated my problem. My main issue is that the hangers are not sizing according to the duct size but rather sticking with their width dimension even though it's unlocked. The reason it seemed that nothing was autofilling was because it's only putting in one size hanger i.e. 28" Wide or whatever the size is set to in the item properties, any duct size above or below that will not fill. Same story with round. How do I get the hangers (CID=838) to adjust to the size of the duct??? Thanks in advance!