Nelo: Blog Header Cropping Doesn't Work

I want to add a logo as a blog header image for the Nelo theme. Trouble is, the "Blog Top Header Upload and Crop" doesn't work; I upload an image of the exact size specified in the style.css file and the crop feature either crops half of the vertical image or extends beyond the horizontal, leaving a black box to the right of the logo. (see my testbed at http://wpmatrix.com)

Is there any way to either allow users to specify a filename in the options tab or hardcode a logo image in the header.php?