[PappaSmurf]

why are you going to the guy and opening the window before pressing do exchanges?

If I do not have the Collectable Appraiser window open, then it does appear to work now. 

However, to answer your question, Sebbs, why would I not have the collectable appraiser's window open? When I use the addon to sell junk items to a vendor I normally open the npc's window before I "enable" sellout. Not saying that this method is correct or not, but it does work just fine that way. So with that being said, I would expect the exchange function to work in a similar fashion or to be documented somewhere that this already established manner of operation does not work the same way when doing exchanges. I think the main problem is, there is NO documentation at all on the exchange functionality and that is where the confusion comes in. Please do not read this as me bitching about the addon, because I am not. I find the sellout addon extremely useful and I use it a lot. I appreciate all of the hard work all of the devs put into these addon's which make my life much easier, just trying to clarify why there seems to be some confusion on how this feature works.