Custom post types on WP 3.0 - Image upload woes

I want to add posts to a custom post type via GravityForms. I have successfully set this up in GravityForms and when the form is submitted the correct post type is set to the post and even a custom taxonomy is set.

However the image upload doesn't seem to work. No images show up in the post / WordPress Media Library. The images do show up when viewing entries in the GravityForms interface.

Any ideas what may be causing this? It works just fine when it's just a default post that gets added instead of setting a custom post type. Here's the code that creates the post type:

// Photos post type
	register_post_type( 'sp_photos',
		array(
			'labels' => array(
				'name' => __( 'Photos' ),
				'singular_name' => __( 'Photo' ),
				'add_new' => __( 'Add New' ),
				'add_new_item' => __( 'Add New Photo' ),
				'edit' => __( 'Edit' ),
				'edit_item' => __( 'Edit Photo' ),
				'new_item' => __( 'New Photo' ),
				'view' => __( 'View' ),
				'view_item' => __( 'View Photo' ),
				'search_items' => __( 'Search Photos' ),
				'not_found' => __( 'No photos found' ),
				'not_found_in_trash' => __( 'No photos found in Trash' ),
			),
			'public' => true,
			'show_ui' => true,
			'publicly_queryable' => true,
			'exclude_from_search' => true,
			'hierarchical' => false,
			'supports' => array( 'title', 'editor', 'custom-fields', 'thumbnail' ),
			'rewrite' => array( 'slug' => 'photos', 'with_front' => false ),
			'can_export' => true,
		)
	);

And what changes the post type in the form in GravityForms:

/**
 * Sets our custom post types and taxonomies
 */

function sp_gravity( $post_data, $form ) {
	if( $form["id"] == '5' ) {
		// Set our custom post type
		$post_data["post_type"] = "sp_photos";
	}
	return $post_data;
}

add_filter( 'gform_post_data', 'sp_gravity', 10, 2 );

I created a form from scratch as you suggested with just the title and the image and it worked. Then I added all the other fields exactly like in the other form and everything works properly.

Then I tried the old one again and that one still doesn't work. Tried the new one and it works just fine.

Weird stuff. Guess I'll just re-do all the forms from scratch.