That was my seat of the pants impression, that the boot would be $4K. I've added Old and New to the basic input information in my original post, as well as acknowledging that the line 15 Smart Worksheet is operating correctly.
Any boot calculations simply has to come out of the program based on the input, it can't be coming from the user. That "Different property received" page, to my mind, is very clearly asking about "other property" (not like-kind) that a user is able to identify and there simply isn't any. But you can't proceed through the interview until you put something in there. That, to me, is a BUG.
