Hello, I followed the directions indicated in the documentation, even used the acme image fix plug-in and have uploaded photos with at least 1280px in size. Won’t this suffice? However, the size of the featured image of each of the “latest post” is relatively small (half the size in terms of width) in the homepage.
Also as mentioned previously, some photo in the slider section is “dislocated”.
You may check out the slider and display in my blog for your reference.
http://www.storiesofawandergirl.com