I know the location and size of drag and drop objects are very sensitive in Captivate 7. I have targets that do not overlap each other and they are 20 pixels larger than the drag objects. The interaction still does not score a correct response. The hit area padding is set for 0 and the snap position is absolute. The drag objects and the targets are smart shapes.
I can provide the Captivate file if anyone is willing to look at it.