I cannot see ANY images in the new UK Military Campaign Medal and Award Rolls, 1793-1949.
My computer is an iMac running OS X 10.6.3 (Snow Leopard)
This can be checked out by looking at a record which does work as it should. In another newly uploaded database, UK Naval Medal and Award Rolls, 1793-1972, the height and width variables have sensible numbers:
var iw = 5517;
var ih = 3798;
The downloaded image (at 200%) has pixel dimensions of 5517 x 3798.
I do wish Ancestry would learn from their past mistakes.