Images do not resize when entering a custom size for them to display. The admin panel shows the scaled image, but the published page displays original size — not the scaled image.
IE: Original image is 300px wide, I enter a custom size of 100px wide. The scaled image is shown at the custom size of 100px wide in the editor panel. Published image is 300px wide.
I switch to another Genesis theme and my custom image displays at 100px wide – as expected.
See a page with screen captures here:
http://www.yourproofs.com/image-problems/