This post content shows the image sizes that the blog software is managing. These sizes reflect all of the various images that are created from any uploaded image. The zero-size entries are caused by the theme adding some new sizes and then me getting rid of them by zeroing the width and height. This keeps the files of those sizes from getting generated.

Array
(
    [thumbnail] => Array
        (
            [width] => 100
            [height] => 100
            [crop] => 
        )

    [medium] => Array
        (
            [width] => 300
            [height] => 300
            [crop] => 
        )

    [medium_large] => Array
        (
            [width] => 768
            [height] => 0
            [crop] => 
        )

    [large] => Array
        (
            [width] => 600
            [height] => 600
            [crop] => 
        )

    [blog-thumb] => Array
        (
            [width] => 0
            [height] => 0
            [crop] => 
        )

    [blog-thumb-vertical] => Array
        (
            [width] => 0
            [height] => 0
            [crop] => 
        )

    [blog-thumb-2column-sidebar] => Array
        (
            [width] => 0
            [height] => 0
            [crop] => 
        )

    [blog-thumb-widget] => Array
        (
            [width] => 10
            [height] => 10
            [crop] => 
        )

)