Index: ms-functions.php
===================================================================
--- ms-functions.php	(revision 15309)
+++ ms-functions.php	(working copy)
@@ -1105,7 +1105,7 @@
 
 function upload_is_user_over_quota( $echo = true ) {
 	if ( get_site_option( 'upload_space_check_disabled' ) )
-		return true;
+		return false;
 
 	$spaceAllowed = get_space_allowed();
 	if ( empty( $spaceAllowed ) || !is_numeric( $spaceAllowed ) )