Index: wp-admin/includes/media.php
===================================================================
--- wp-admin/includes/media.php	(revision 22103)
+++ wp-admin/includes/media.php	(working copy)
@@ -2141,7 +2141,7 @@
 		<div class="imgedit-response" id="imgedit-response-<?php echo $attachment_id; ?>"></div>
 
 		<div class="wp_attachment_image" id="media-head-<?php echo $attachment_id; ?>">
-			<p><img class="thumbnail" src="<?php echo set_url_scheme( $thumb_url[0] ); ?>" style="max-width:100%" width="<?php echo $thumb_url[1]; ?>" alt="" /></p>
+			<p id="thumbnail-head-<?php echo $attachment_id; ?>"><img class="thumbnail" src="<?php echo set_url_scheme( $thumb_url[0] ); ?>" style="max-width:100%" alt="" /></p>
 			<p><?php echo $image_edit_button; ?></p>
 		</div>
 		<div style="display:none" class="image-editor" id="image-editor-<?php echo $attachment_id; ?>"></div>
Index: wp-admin/includes/image-edit.php
===================================================================
--- wp-admin/includes/image-edit.php	(revision 22103)
+++ wp-admin/includes/image-edit.php	(working copy)
@@ -711,11 +711,17 @@
 		update_post_meta( $post_id, '_wp_attachment_backup_sizes', $backup_sizes);
 
 		if ( $target == 'thumbnail' || $target == 'all' || $target == 'full' ) {
-			$file_url = wp_get_attachment_url($post_id);
-			if ( $thumb = $meta['sizes']['thumbnail'] )
-				$return->thumbnail = path_join( dirname($file_url), $thumb['file'] );
-			else
-				$return->thumbnail = "$file_url?w=128&h=128";
+			// Check if it's an image edit from attachment edit screen
+			if ( false !== strpos( wp_get_referer(), 'post.php' ) ) {
+				$thumb_url = wp_get_attachment_image_src( $post_id, array( 900, 600 ), true );
+				$return->thumbnail = $thumb_url[0];
+			} else {
+				$file_url = wp_get_attachment_url($post_id);
+				if ( $thumb = $meta['sizes']['thumbnail'] )
+					$return->thumbnail = path_join( dirname($file_url), $thumb['file'] );
+				else
+					$return->thumbnail = "$file_url?w=128&h=128";
+			}
 		}
 	} else {
 		$delete = true;