Yes dragging images from IE into Xtreme always shrinks the image (192dpi), but this is overcome by holding SHIFT while you drag, then the 96dpi is retained.
FireFox dragging doesn't work though (you end up with a text URL line), but copy'n'paste works fine without any dpi change.
Opera works the same as FireFox and SAFARI, well I uninstalled a week ago as I really dislike it a lot.