P: Compare function in Develop module does not work with the new raw profiles

I have been eager to try the new RAW Profiles released recently.  But they don't seem to work within the Develop Compare function.  For example, let's say I apply 4-5 profiles successively.  And then I want to use the Compare function to help me choose the one I like best.  The program won't let me click-and-drag previous states from the History panel.
I am a long-time user of Lr and I know  how it is supposed to work.  You choose the Y|Y Compare function and it is supposed to allow you to click previous Develop steps and drag them into the left pane of Before/After.  With these new profiles, the clicking-and-dragging does not work, or if it does at all, it is very sporadic: maybe you can drag one earlier version in, but if you try to click-and-drag another one, nothing changes in the Before panel.  But substantially, it just doesn't work.