Wes,
Thanks and sorry. Sorry that I didn’t direct you to the specific archive (Featured Posts) that demonstrated the photo width problem. I was brain-dead on that one.
Thanks that you: 1.) explained how featured images work / don’t work with Genesis; 2.) provided the thread with the CSS edit solution. Editing the style.css file as indicated did work.
Thanks for the help and solution. You can close out this thread.