I am trying to get Plan Regions to work properly but it seems like ducts and pipes are somehow immune to them. For anything else it works properly: the area contained by the plan region boundary is controlled by a view range separate from the rest of the view. However my ducts and pipes are always controlled by the view range of the main view even when they are in the Plan region.
I found another post where this problem was mentioned here http://forums.augi.com/showthread.php?t=114740 and it was suggested that I install the latest update, which i did, but the problem persists.