Index: wp-admin/includes/image.php
===================================================================
--- wp-admin/includes/image.php	(revision 18977)
+++ wp-admin/includes/image.php	(working copy)
@@ -103,7 +103,7 @@
 		// make thumbnails and other intermediate sizes
 		global $_wp_additional_image_sizes;
 
-		foreach ( get_intermediate_image_sizes() as $s ) {
+		foreach ( array_keys( get_intermediate_image_sizes() ) as $s ) {
 			$sizes[$s] = array( 'width' => '', 'height' => '', 'crop' => FALSE );
 			if ( isset( $_wp_additional_image_sizes[$s]['width'] ) )
 				$sizes[$s]['width'] = intval( $_wp_additional_image_sizes[$s]['width'] ); // For theme-added sizes
Index: wp-includes/media.php
===================================================================
--- wp-includes/media.php	(revision 18977)
+++ wp-includes/media.php	(working copy)
@@ -583,7 +583,13 @@
  */
 function get_intermediate_image_sizes() {
 	global $_wp_additional_image_sizes;
-	$image_sizes = array('thumbnail', 'medium', 'large'); // Standard sizes
+	$image_sizes = array('thumbnail', 'medium', 'large'); // Standard sizes	
+	foreach ( $image_sizes as $size ) {
+		$image_sizes[ $size ]['width']	= intval( get_option( "{$size}_size_w") );
+		$image_sizes[ $size ]['height'] = intval( get_option( "{$size}_size_h") );
+		// Crop false per default if not set
+		$image_sizes[ $size ]['crop']	= get_option( "{$size}_crop" ) ? get_option( "{$size}_crop" ) : false;
+	}
 	if ( isset( $_wp_additional_image_sizes ) && count( $_wp_additional_image_sizes ) )
 		$image_sizes = array_merge( $image_sizes, array_keys( $_wp_additional_image_sizes ) );
 
Index: wp-includes/post.php
===================================================================
--- wp-includes/post.php	(revision 18977)
+++ wp-includes/post.php	(working copy)
@@ -3817,7 +3817,7 @@
 	}
 
 	// remove intermediate and backup images if there are any
-	foreach ( get_intermediate_image_sizes() as $size ) {
+	foreach ( array_keys( get_intermediate_image_sizes() ) as $size ) {
 		if ( $intermediate = image_get_intermediate_size($post_id, $size) ) {
 			$intermediate_file = apply_filters('wp_delete_file', $intermediate['path']);
 			@ unlink( path_join($uploadpath['basedir'], $intermediate_file) );