Index: wp-includes/script-loader.php
===================================================================
--- wp-includes/script-loader.php	(revision 23175)
+++ wp-includes/script-loader.php	(working copy)
@@ -699,11 +699,16 @@
 			echo "</script>\n";
 		}
 
-		$concat = str_split( $concat, 128 );
-		$concat = 'load[]=' . implode( '&load[]=', $concat );
+		while( strlen( trim( $concat, ', ' ) ) > 500 ) {
+			$index = strrpos( $concat, ',', 500 );
+			$segment = substr( $concat, 0, $index );
+			$concat = substr( $concat, $index );
+			$src = $wp_scripts->base_url . "/wp-admin/load-scripts.php?c={$zip}&load=" . trim( $segment, ', ' ) . '&ver=' . $wp_scripts->default_version;
+			echo "<script type='text/javascript' src='" . esc_attr( $src ) . "'></script>\n";
+		}
 
-		$src = $wp_scripts->base_url . "/wp-admin/load-scripts.php?c={$zip}&" . $concat . '&ver=' . $wp_scripts->default_version;
-		echo "<script type='text/javascript' src='" . esc_attr($src) . "'></script>\n";
+		$src = $wp_scripts->base_url . "/wp-admin/load-scripts.php?c={$zip}&load=" . trim( $concat, ', ' ) . '&ver=' . $wp_scripts->default_version;
+		echo "<script type='text/javascript' src='" . esc_attr( $src ) . "'></script>\n";
 	}
 
 	if ( !empty($wp_scripts->print_html) )
Index: wp-admin/load-scripts.php
===================================================================
--- wp-admin/load-scripts.php	(revision 23175)
+++ wp-admin/load-scripts.php	(working copy)
@@ -114,13 +114,9 @@
 	return @file_get_contents($path);
 }
 
-$load = $_GET['load'];
-if ( is_array( $load ) )
-	$load = implode( '', $load );
+$load = preg_replace( '/[^a-z0-9,_-]+/i', '', $_GET['load'] );
+$load = explode( ',', $load );
 
-$load = preg_replace( '/[^a-z0-9,_-]+/i', '', $load );
-$load = explode(',', $load);
-
 if ( empty($load) )
 	exit;