@natchuralehair: Did you read my previous replies?
The image that should be showing in your homepage top area is this:
It's 590x332 pixels. If it was 620×380 (or larger), it would show.
In case there's a misunderstanding: presizing means creating a properly sized image in an image editing application before uploading it, not resizing via the image tool of the post editor: the sizing options have no effect on featured images.
And as I said above, this is a change that WP decided yesterday or so, and I guess they're still working on it. At the moment properly sized images in Structure will show on the homepage top area but not in the single post view (if you have enabled that option).
@tandava108: Properly sized images in Coraline do work. The right size for Coraline is 990x180 pixels.