Admin CSS being overwritten by Site CSS

OK. ESMI, you’re right: it doesn’t occur with the parent theme.

So that means my child theme, which was working fine up until this point, has broken with 3.6. Back to the drawing board? What would cause them to overlap like that?

Well, it helps if you mean by that it gets rid of my css changes completely. 8|

Here is what was in the functions.php:

<?php
// Remove the Adventure Journal parent style.css and add the child theme's style.css

add_action( 'wp_print_styles' , 'mh_remove_parent_css' , 50 );
function mh_remove_parent_css() {
        wp_dequeue_style( 'theme' );
        wp_enqueue_style( 'child-theme' , get_bloginfo( 'stylesheet_directory' ) . '/style.css' , '' , '' );
}

I am not proficient with PHP. Is this something I can alter or replace to make my child css work properly?