Can’t Edit Custom Post Items

I have a weird issue and I can’t figure it out for the life of me. Just converted my work-in-progress studio’s website to WP 3.0 and immediately set out to take advantage of some of the new features. I had a Custom Post Type called “Artists” up and working great. At some point in my mucking around in the functions.php file, I mucked something up and now I cannot edit any existing posts of that type. If I create a new one, I can edit it, but the old ones cannot be edited. Here’s a screenshot of the list of posts of the Artists post type to better explain what I mean.

http://nicoleglynn.com/artist.png

When I hover over each item, my only option is to view it, I cannot edit, delete, or change the status of any posts that existed before I did whatever I did to much it up. There isn’t even a checkbox next to them for me to perform bulk actions.

This is the relevant code in my functions.php file:

add_action('init', 'create_artist');
	function create_artist() {
    	$artist_args = array(
        	'label' => __('artists'),
        	'singular_label' => __('artist'),
        	'public' => true,
        	'show_ui' => true,
        	'capability_type' => 'post',
        	'hierarchical' => false,
        	'rewrite' => true,
        	'supports' => array('title', 'editor', 'thumbnail')
        );
    	register_post_type('artist',$artist_args);
	}