Why are my graphics size changing when importing FM11 files into FM2015?

We have just upgraded from FM 11 to FM 2015. We write exclusively in structured mode and use Dita 1.2. Our graphics are about 90% in .png format.

All of our graphics were correctly sized in FM 11, but after importing the files into FM 2015, they have lost all of their scaling. Not only that, but when we do scale them, they still take up three pages in the file: one for the title, one for the graphic, and one (just for good measure it seems) after the graphic.

We could manually resize each one, but since there are over 900 of them, this will get monotonous, tedious, boring . . . time consuming.

Why are they resizing, and what can we do about it?

Joseph