Anyone else seeing this? Not sure how many people use .ecw format out there, but this seems like a pretty big regression (there's some precedent for this though... I remember the initial 10.0 release couldn't load .ecw at all).
Screenshot of properties from 10.3 (Cell Size and Extents way too small):
Screenshot from 10.2.2 (Correct cell size):
As displayed in 10.3-- images should be the same size as the polygon squares, instead they render a tiny square in the upper left corner: