WPMU Nelo 2.1.6 - Cannot delete image from Custom Home Page


I'm working with WPMU Nelo, which is a lovely theme. I'm having trouble deleting the "Blog Box Center Image" from the Custom Home Page.

I uploaded an image and want to replace it. When I click the "Delete" button, the page refreshes but the image is still there.

I can delete all the other images on the page including Blog Box Left, Blog Box Right and Blog Top Header. Blog Box Right does not preview, however, it does allow me to delete.

Any ideas?

Thank you,